Nuts

29th April 20213rd May 2021 By Simon

Words for nut and related words in Celtic languages.

Proto-Celtic	knūs / knuwjā- = nut
Old Irish (Goídelc)	cnú [knuː] = nut cnú frangcach = walnut
Irish (Gaeilge)	cnó = nut cnó capaill = horse-chestnut cnó cócó = coconut cnó coill/gealach = hazelnut cnó francach/gallda = walnut
Scottish Gaelic (Gàidhlig)	cnò [krɔ̃ː] = nut; vesicle, gas bladder (on seaweed) cnò-almoin = almond cnò challtainn = hazelnut cnò-chòco = coconut cnò Fhrangach = walnut cnò-gheanmnaidh = chestnut cnò-thalmhainn = groundnut, peanut
Manx (Gaelg)	cro = nut, gall cro almon/Greagagh = almond cro coull = hazelnut cro bainney = coconut cro teayst = doughnut cro thallooin = peanut, groundnut, monkey nut
Proto-Brythonic	*know = nut
Welsh (Cymraeg)	cnau [knaɨ̯/knai̯] = nuts cneuen = nut cnau almond = almongs cnau barfog = hazelnuts, chestnuts cnau ceffylau = horse-chestnuts cnau coco = coconuts cnau Ffrengig = walnutes
Cornish (Kernewek)	know [knoʊ] = nuts knowen, knofen = nut know dor = peanuts know Frenk/Frynk = walnuts know koko = coconuts know koll = hazelnuts know toos = doughnuts
Old Breton	cnou = nut
Breton (Brezhoneg)	kraoñ [kʁɔ̃] = nuts, walnuts kraonenn = nut kraoñ-kelvez = hazelnuts kraoñ-kokoz = coconuts

Etymology: possibly from the Pre-Celtic *knuHs. Cognate with the Proto-Germanic *hnuts (nut) and the Latin nux (nut, nut tree, almond tree), which come from the from Proto-Indo-European *knew- [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis

Bread

24th April 202125th April 2021 By Simon

Words for bread and related words in Celtic languages.

Proto-Celtic	*ar(-akno)- = bread
Old Irish (Goídelc)	arán [ˈaraːn] = bread, loaf of bread
Middle Irish (Gaoidhealg)	arán [ˈaraːn] = bread
Irish (Gaeilge)	arán [əˈɾˠɑːn̪ˠ / ˈaɾˠanˠ] = bread arán baile = home-baked bread arán bán = white bread, baker’s bread arán coirce = oatbread, oatcake arán donn, arán rua = brown bread arán prátaí = potato cake
Scottish Gaelic (Gàidhlig)	aran [aɾan] = bread, loaf; livelihood, sustenance aran-coircearan-donn, aran ruadharan-eòrnaaran milisaran-seagail
Manx (Gaelg)	arran = bread arran Albinagh = shortbread arran bainney = bread roll arran bane = white bread arran dhone, arran ruy = brown bread arran greddan(it) = toast arran shoggyl = rye bread

Etymology: from the Proto-Celtic *arankā- (grain) [source].

Proto-Celtic	bargo / baragenā / *barginā = cake, bread
Old Irish (Goídelc)	barigen [ˈˈbarʲ.ɣʲən] = bread, loaf of bread
Irish (Gaeilge)	bairín = loaf bairín breac = barmbreac
Scottish Gaelic (Gàidhlig)	bairghin = bread, cake
Manx (Gaelg)	berreen = cake
Welsh (Cymraeg)	bara [ˈbara / ˈbaːra] = bread, loaf, slice; food, meal, sustenance, livelihood bara barlys = barley bread bara beunyddiol = daily bread bara brith = currant bread bara byr = buscuit bara ceirch = oat bread, oatcake bara coch = brown bread, barley bread bara drwg = bad bread, bad state, difficulties bara gwyn = white bread bara lawr = laverbread (made with edible seaweed) bara poeth = gingerbread, hot bread
Old Cornish	bara = bread
Cornish (Kernewek)	bara = bread bara byghan/bian = roll bara gwaneth = wheaten bread bara leun = wholemeal bread bara sugal = rye bread
Breton (Brezhoneg)	bara [ˈbɑː.ra] = bread bara bis = brown bread bara brazed = wholemeal bread bara brizh = currant bread bara gwenn = white bread bara kras = toast

Etymology: from the Proto-Indo-European *bʰars- (spike, prickle). Words from the same root include the English barley, the Scots bere/beir (barley), the Swedish barr (pine/fir needle), the Icelandic barr (pine needle), the Old Norse barr (corn, grain, barley), and the Latin far (spelt, coarse meal, grits), and words for flour in Romance languages, such as farine in French [source].

Words marked with a * are reconstructions.

You can find the origins of the English words bread and loaf on Radio Omniglot.

Butter

15th April 202117th April 2021 By Simon

Words for butter and related words in Celtic languages.

Proto-Celtic	*emban = butter
Old Irish (Goídelc)	imb/imm [imʲbʲ] = butter
Irish (Gaeilge)	im [aimʲ / iːmʲ / ɪmʲ] = butter saill ime = butterfat uachtar ime = buttercream
Scottish Gaelic (Gàidhlig)	ìm [iːm] = butter imeach [iməx] = buttery, producing butter
Manx (Gaelg)	eeym = butter eeymagh = buttery
Middle Welsh (Kymraec)	ymenyn = butter
Welsh (Cymraeg)	(y)menyn [əˈmɛnɨ̞n / əˈmeːnɪn] = butter, curds blodyn menyn = buttercup (y)menyneiddiwch = butteriness (y)menynaidd = buttery
Old Cornish	amanen = butter
Cornish (Kernewek)	(a)manyn = butter
Middle Breton	amanen = butter
Breton (Brezhoneg)	amann [ã.ˈmãnː] = butter amanennañ [ã.ˈmãnː] = to butter amanenner [ã.ˈmãnː] = butter dish kouign-amann = kouign-amann (a traditional Breton butter cake)

Etymology: from the Proto-Indo-European *h₃engʷen- (fat, butter), from *h₃engʷ- (to smear, anoint) [source].

Words marked with a * are reconstructions.

Cheese

7th April 20218th April 2021 By Simon

Words for cheese and related words in Celtic languages.

Old Irish (Goídelc)	cáise = cheese
Irish (Gaeilge)	cáis [kɑːʃ / kæːʃ] = cheese cáiseoir = cheese-maker, cheese-monger cáisiúil = cheesy
Scottish Gaelic (Gàidhlig)	càise [kaːʃə] = cheese càisean, cùl-càise = cheese rind brèid-càise, anart-càise = cheesecloth
Manx (Gaelg)	caashey = cheese, cheesy caasheydagh = cheesy
Proto-Brythonic	*kọs = cheese
Middle Welsh (Kymraec)	caws, caus = cheese
Welsh (Cymraeg)	caws [kau̯s] = cheese, curds, a cheese cawsa = to beg cheese, collect cheese cawsai = cheese begger, one who makes cheese cawsaidd = caseous, cheesy cawsion = curd, curds, curdlings cawslestr = cheesel, cheese vat/mould cawslïain = cheese-cloth cawsty = cheese house, dairy cosyn [ˈkɔsɨ̞n / ˈkɔsɪn] = a piece of cheese
Cornish (Kernewek)	keus [køːs] = cheese keuswask = cheese press
Breton (Brezhoneg)	keuz = cheese keuzerezh = cheese factory

Etymology: from the Latin cāseus (cheese), from the Proto-Indo-European *kwh₂et- (to ferment, become sour) [source].

Middle Breton)	fourondec, foulondec = cheese
Breton (Brezhoneg)	formaj = cheese fourmajerezh = cheese factory

Etymology: from the Latin Latin fōrmāticum (cheese), short for cāseus fōrmāticus (form cheese), from cāseus (cheese) amd fōrma (form, mold) [source]. More cheesy words in European languages.

Words marked with a * are reconstructions.

Easter

2nd April 20212nd April 2021 By Simon

Words for Easter and related words in Celtic languages.

Old Irish (Goídelc)	Cásc = Easter
Irish (Gaeilge)	Cáisc [kɑːʃc / kæːʃc] = Easter Domhnach Cásca,Cáisc Shona duit = Happy Easter ubh Chásca = Easter egg
Scottish Gaelic (Gàidhlig)	A’ Chàisg [əˈxaːʃgʲ] = Easter Càisg nan Iùdhach = Passover Dihaoine na Càisge = Good Friday ugh na Càisge = Easter egg A’ Chàisg sona = Happy Easter
Manx (Gaelg)	Caisht = Easter caisht ny hewnyn = Passover Jerdein Caisht = Maunday Thursday Jeheiney Caisht = Good Friday Laa Caisht = Easter Day Caisht sonney dhyt! = Happy Easter!
Middle Welsh (Kymraec)	Pasc, Passc = Easter
Welsh (Cymraeg)	Pasg = Easter, Passover Pasg yr Wyau = Easter Sunday wy’r Pasg = Easter egg Pasg hapus = Happy Easter Pasg yr Iddewon = Passover
Cornish (Kernewek)	Pask [pʰaːsk, pʰask] = Easter, Passover Pask Lowen = Happy Easter
Breton (Brezhoneg)	Pask = Easter, Passover Pask Seder = Happy Easter

Etymology: from the Late Latin pascha (Passover, Easter), from Ancient Greek πάσχα (páskha – Passover), from Aramaic פסחא‎ (paskha – Passover), from Hebrew פֶּסַח‎ (pesaḥ -Passover). [source].

Happy Easter in many languages

Words marked with a * are reconstructions.

Hillsides

26th March 20212nd November 2021 By Simon

Words for hillsides, cliffs and related words in Celtic languages.

Proto-Celtic	*altos = height, cliff
Old Irish (Goídelc)	alt, allt = height, cliff, valley, abyss
Middle Irish (Gaoidhealg)	als = hillock
Irish (Gaeilge)	ailt = steep-sided glen, ravine, height, cliff ailteán = small ravine alt = steep-sided ravine, hillock altach = undulating (road), wavy (hair) altán = streamlet, ravine, hillock
Scottish Gaelic (Gàidhlig)	alt [al̪ˠd] = rugged/steep bank, precipice allt [aul̪ˠd] = brook, burn, stream, brook, rill, river with precipitous banks alltan = brook, little stream, streamlet
Manx (Gaelg)	alt = mountain stream, glen in mountains, high place, altitude, alto
Middle Welsh (Kymraec)	alt, allt = hill(side)
Welsh (Cymraeg)	allt [aːɬt / aɬt] = hill(side), (steep) gradient or slope, steep road or path, (steep) ascent, cliff, woods, wooded slope allt (o) goed = wood, grove allt (y) môr, allt fôr = sea-cliff yr allt bren = staircase, facet (“the wooden hill”)
Old Cornish	als = cliff
Cornish (Kernewek)	als [ɒlz / ælz] = cliff
Middle Breton	a(o)ut = coast, shore, bank
Breton (Brezhoneg)	aod = coast, shore aod bili = pebble beach aod vev = foreshore

Etymology: from the Proto-Indo-European *h₂eltós, from Proto-Indo-European *h₂el- (to grow, nourish) [source].

English words such as altitude, adult and old come from the same PIE root, as do alt (old, ancient, elderly) in German, oud (old) in Dutch, haut (high, tall) in French and alto (high, tall, deep, loud) in Italian [source].

Words marked with a * are reconstructions.

Bridges

16th March 202117th April 2024 By Simon

Words for bridges and related words in Celtic languages.

Words marked with a * are reconstructions.

Old Irish (Goídelc)	drochet [ˈdroxʲed] = bridge
Middle Irish (Gaoidhealg)	drochet, drochat, droichet = bridge, causeway drochetech, drochetóir = bridge-maker
Irish (Gaeilge)	droichead [ˈd̪ˠɾˠɛçəd̪ˠ] = bridge droichead crochta = suspension bridge droichead tógála = drawbridge droichead meáite = weigh bridge droichead veidhlín = bridge of a violin droichead sróine = bridge of the nose
Scottish Gaelic (Gàidhlig)	drochaid [drɔxɪdʲ] = bridge drochaid air fleodradh = pontoon drochaid-thogalach, drochaid-thogail = drawbridge drochaid-choise = footbridge drochaid-rathaid = road bridge, viaduct drochaid-thionndain = swing bridge
Manx (Gaelg)	droghad = bridge, bridge of ship, arch, gantry droghad aae = viaduct droghad cassee = swing bridge droghad coshey = gangway, footbridge droghad croghit = suspension bridge droghad keesh = toll bridge droichead meihaghey = weigh bridge

Etymology: from Old Irish droch (wheel, circlet) and sét (path) [source].

Gaulish	ponto = bridge
Proto-Brythonic	*pont = bridge
Cumbric	*pont = bridge
Old Welsh (Kembraec)	pont = bridge
Middle Welsh (Kymraec)	pont, pynt = bridge, drawbridge
Welsh (Cymraeg)	pont [pɔnt] = bridge, drawbridge, viaduct, aqueduct pontio = to bridge (a gap), to transition pont godi = drawbridge pont grog = suspension bridge pont trwyn = bridge of the nose pont y glaw, pont law = rainbow pont ysgwydd = collar-bone, clavicle pontio = to bridge, span, arch pont(i)og = like a bridge, arched of the nature of a bridge pont(i)wr, pontydd = a bridge-builder pontyddiaeth = bridge-building
Old Cornish (Cernewec)	pons = bridge
Middle Cornish (Cernewec)	pons = bridge
Cornish (Kernewek)	pons = bridge ponsfordh = viaduct pons travalya = travelling bridge
Middle Breton (Brezonec)	pont = bridge
Breton (Brezhoneg)	pont [pɔ̃nt] = bridge, top of the furrow, culvert, trigger guard pontan, pontañ = to bridge, lay flat stones (on a ditch or stream) pont-tro = swing bridge pont hent-houarn = railway bridge pont dilestrañ = bridge, deck (of ship) pont kargañ = loading deck pont-tro = swing bridge

Etymology: from Latin pōns (bridge, deck), from Proto-Indo-European *pónteh₁s (path, road), from *pent- (path). Words from the same roots include pont (bridge) in French, puente (bridge) in Spanish, път [pɤt] (road, way, path, journey, way) in Bulgarian source].

Proto-Celtic	*brīwā = bridge
Gaulish	briua = bridge
Leptonic	𐌐𐌓𐌖𐌉𐌀𐌌 (pruiam) = funerary construction (perhaps a grave)

Etymology: from Proto-Indo-European *bʰerw/*bʰrēw (wooden flooring, decking, bridge), which is also the root of the English words bridge and brig, and Brücke (bridge) in German [source].

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Peaks

11th March 202114th March 2024 By Simon

Words for peaks and tops and related words in Celtic languages.

Words marked with a * are reconstructions.

Proto-Celtic	bandā = top, peak; horn benno- = peak, top
Gaulish	*benn/bannā** = peak
Old Irish (Goídelc)	benn [bʲen͈] = mountain, crag, peak, point, crest, summit, pinnacle, spire; gable, corner, horn (of animal), drinking horn, prong, crest bennán = horned animal, cow, calf; horned or peaked object
Middle Irish (Gaoidhealg)	benn = mountain, crag, peak, point, crest, summit, pinnacle, spire, gable, corner, prong, crest bennacán = little horned one, calf bennach = pointed, peaked, horned bennán = a horned animal, calf bennchopor = steeple, tower
Irish (Gaeilge)	beann = horn, antler; drinking horn; prong (of fork) beannach = horned, antlered, pronged, peaked, gabled, angular beannógach = peaked,angular binn = peak; gable; cliff; corner, edge, margin; lap; side, portion
Scottish Gaelic (Gàidhlig)	beann [bjaun̪ˠ] = horn, peak, top, corner, skirt beannach = [bjan̪ˠəx] = pointed, horned beinn [bein̪ʲ] = mountain, mount, high hill beinn-theine = volcano eigh-bheinn = iceberg
Manx (Gaelg)	beinn = mountain, ben, summit, pinnacle, apex, tine of deer beinn rioee = iceberg
Proto-Brythonic	*bann = top, peak
Middle Welsh (Kymraec)	bann, = top, tip, peak, summit
Welsh (Cymraeg)	ban [ban] = top, tip, peak, summit, crest, peak, beacon, height, pinnacle, turret, hill, mountain, bare hill; chief; drinking horn, horn (of animal); arm, branch, beam, point (of cross) bannau’r byd = corners, quarters or regions of the world, the ends of the earth ban caer, ban y gaer = rampart of a fort; top or height of a fortess ban lleuad = quarters of the moon, new moon
Middle Cornish (Cernewec)	ban = that which is high, a height, mountain, summit
Cornish (Kernewek)	ban = prominence
Breton (Brezhoneg)	bann = rising, uphill, upright, post, column

Etymology: from the Proto-Indo-European *bn̥dʰéh₂ from *bendʰ- (pin, point). The Scots word ben (mountain, hill) comes from the Scottish Gaelic beinn. From Gaulish we get the Catalan words banya (horn) and banyut (horned, unfaithful), and the Occitan bana (horn), and the English word pin comes from the same PIE root [source].

See the post about Mountains for other mountain-related words, such as sliabh in Irish and Scottish Gaelic, and mynydd in Welsh.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Water

5th March 202122nd March 2022 By Simon

Words for water and related words in Celtic languages.

There are several words for water in Proto-Celtic: *akʷā-, *boglo-, *dubro-, *iskā-, *lawo-, *udeskio-, *utso-, *φeno-, *φono- and *stagro-. Only a few of them have descendents in the modern Celtic languages.

Proto-Celtic	dubros = water, dark dubrokū = otter (“water dog”) *dubro-jarā = water-hen
Gaulish	uerno-dubrum = name of a river
Old Irish (Goídelc)	dobur [ˈdovur] = water, river doburchú [ˈdovurˌxuː] = otter (“water dog”)
Middle Irish (Gaoidhealg)	dobrán = water
Irish (Gaeilge)	dobhar = water; flood, torrent; darkness, dullness, obscurity dobhartha = watery, wet; dull, gloomy. dobharchú = otter (“water dog”) dobharchlog = water clock dobhardhroim = watershed dobhareach = hippopotamus dobharlí = water-colour dobhrán = otter; dull-witted, stupid, person
Scottish Gaelic (Gàidhlig)	dobhar [do.ər] = water (archaic) dobhar-chù [do.ərxu] = otter, beaver (“water dog”) dobhar-lus [r̪ˠɔːhdəx] = (water)cress dòbhran [dɔːran] = otter
Manx (Gaelg)	dooarchoo = otter, beaver (“water dog”) doour = reservoir, dam
Proto-Brythonic	duβr = water düβrgi = otter
Middle Welsh (Kymraec)	dwfyr [ˈduvər] = water
Welsh (Cymraeg)	dŵr [duːr], dwfr [dʊvr] = water; urine; pus dyfrgi, dwrgi = otter (“water dog”) dyfrgiad = watering, irrigation, urination dyfrio, dyfru = to water, to irrigate, to run, to urinate dyfrig = dripping, foaming (of a horse) dyfraidd = aqueous, waterish, aquatic
Cornish (Kernewek)	dowr [doʊɹ] = water; river dowrgi = otter (“water dog”) dowra = to water dowrhe = to irrigate dowrvagh = hippopotamus dowrliw = water-colour
Middle Breton	dour = water
Breton (Brezhoneg)	dour [ˈduːr] = water; rain, tears, sweat, saliva dourgi = otter (“water dog”) douraerouant = hydra dourliv, dourlivadur = water-colour dournijerez = seaplane, flying boat, hydroplane

Etymology: from the Proto-Indo-European *dʰubrós (dark) from *dʰewb- (deep) [source].

Proto-Celtic	*udenskyos = water
Old Irish (Goídelc)	uisce [ˈusʲkʲe] = water
Irish (Gaeilge)	uisce [ˈɪʃk̟ɪ] = water; rain, tears, saliva uisceadán = aquarium uiscebhealach = waterway uiscedhath = watercolour uiscedhíonach = waterproof uisce-obach = watertight uiscerian = aqueduct uiscigh = to water, irrigate uisciú = irrigation
Scottish Gaelic (Gàidhlig)	uisge [ɯʃgʲə] = water; rain; river (in place names) uisgeadan [ɯʃgʲədan] = aquarium; body of water uisge-dhath, dath-uisge = watercolour uisge-dhìonach = waterproof, impervious; watertight uisgrian = aqueduct fuar-uisge = cold rain, cold water slighe-uisge = waterway uisgich [ɯʃgʲɪç] = to water, irrigate uisgeachadh [ɯʃgʲəxəɣ] = watering, irrigation
Manx (Gaelg)	ushtey [ˈuʃtʲə] = water ushteydane = aquarium bollagh ushtey, coorse ushtey, raad ushtey = waterway ammyr ushtey, droghad ushtey = aqueduct ushtaghey = to water, irrigate, steep, watering irrigation

Etymology from the Proto-Indo-European *udén, from *wódr̥ (water) [source].

Proto-Celtic	*sālos = saltwater
Old Irish (Goídelc)	sál [saːl], sáile [ˈsaːlʲe] = salt water, brine, seawater; sea, ocean (poetic)
Irish (Gaeilge)	sáile [ˈsˠɑːlʲə] = sea water, sea, salt water, brine
Manx (Gaelg)	sailley = salt water
Proto-Brythonic	*salī = salt, sea water
Welsh (Cymraeg)	hâl [haːl] = salt, salty, saline, akaline heli = brine, salt water, pickle, sea-water, sea
Cornish (Kernewek)	hyli = salt water
Breton (Brezhoneg)	hal = salt water, salt hili = brine, strong sauce

Etymology from the Proto-Indo-European *séh₂ls (salt) [source].

Scottish Gaelic (Gàidhlig)	bùrn [buːr̪ˠn̪ˠ] = (fresh) water, amount of water, (act of) raining bùrn-éirigh = spring water bùrn-iarainn = mineral water bùrn mìn = fine drizzle

Etymology from the Scots burn (a small river), from the Middle English bourne (small stream), from the Old English burne, burna (spring, fountain), from Proto-Germanic *brunnô (stream, brook). the Proto-Indo-European *bʰrun- (a bubbling forth; a fountain, wellspring, source) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau

Frosty Ice

25th February 202131st October 2023 By Simon

Words for frost, ice, cold and related words in Celtic languages.

Words marked with a * are reconstructions.

Proto-Celtic	*ɸreswos = frost
Old Irish (Goídelc)	réúd [r͈ʲeːu̯ð] = frost
Middle Irish (Gaoidhealg)	reód = frost
Irish (Gaeilge)	reo [ɾˠoː / ɾˠɔː] = frost reodóg = icicle reoigh = to freeze, congeal, solidify reoiteach = frosty, chilling reoiteacht = frostiness reoiteog, uachtar reoite = ice cream reomhar = frigid
Scottish Gaelic (Gàidhlig)	reòth [r̪ˠɔː] = frost, freeze, become frozen, congeal reòite [r̪ˠɔːdʲə] = frozen, frosty, icy reòthtach [r̪ˠɔːhdəx] = freezing, frosty reòthadh = freeze reòthadair [r̪ˠɔ.ədɪrʲ] = deep-freeze, freezer stob reòta, caisean-reòta, boidean-reòthaidh = icicle
Manx (Gaelg)	rio = frost, freezing, ice riojey = to freeze, ice up rioeeagh = freezing, frosty rioeeaght = frostiness rioghar, bwoid rioee, kibbin rioee = icicle riojag, key riojey, key riojit = ice-cream rio-stroo, awin rioee = glacier
Middle Welsh (Kymraec)	rew, reo, rev = frost rewlyt, rewlyd, rewllid = icy, freezing, frozen
Welsh (Cymraeg)	rhew [r̥eːu̯ / r̥ɛu̯] = (hoar-) frost, ice rhewaidd = freezing, frosty, icy rhewedig = frozen, icy, extremely cold rhewi = to freeze, preserve; anaesthetize, make numb rhewiadur = refrigerator rhewin = frosty weather rhewllyd, rhewlyd = icy, freezing, frozen, very cold, frigid rhew bargod = icicle rhew du = black ice gwŷn rhew = frost-bite rhedlif rhew = glacier
Old Cornish	reu = ice, frost
Middle Cornish (Cernewec)	rew, reu = frost, ice
Cornish (Kernewek)	rew = ice, frost rewer = freezer rewi = to freeze rewys = frozen downrewi = deep-freeze, freezer dehen rew = ice cream furvell rew = ice tray kub rew = ice cube skes rew = ice skate
Middle Breton (Brezonec)	reau, reo, réau, rëu = frost, frozen
Breton (Brezhoneg)	rev = frost, freezing, freeze rev du = black ice rev noz = night frost

Etymology: from the Proto-Indo-European *prews- (to freeze, frost), which is also the root of the word frost in English [source].

Proto-Celtic	*yegis = ice
Old Irish (Goídelc)	aigred = ice aigretta = icy, frozen
Middle Irish (Gaoidhealg)	aig = ice aigide = icy
Irish (Gaeilge)	oighear [əiɾʲ] = ice oighear dubh = black ice oighreach = glacial leac oighir = (sheet of) ice
Scottish Gaelic (Gàidhlig)	eigh [ej] = ice eigh-bheinn = iceberg eigh-shruth = glacier leac-eighe = ice-floe linn-eighe = ice age pac-eigh = pack ice taigh-eighe = ice house
Proto-Brythonic	*jaɣ = ice
Middle Welsh (Kymraec)	ia, ya = ice, frost
Welsh (Cymraeg)	iâ [jaː] = ice, (hoar-) frost iaaidd = glacical, icy iaënnol = glacical, icy iaeth, iaaeth = iciness, frost, cold, severe winter weather ialyd = icy, freezing, very cold iaog = icy, freezing, frozen iain = very cold, freezing, icy
Old Cornish	iein = ice
Middle Cornish (Cernewec)	iein, iên, yein, yeyn, yên = cold (as ice), frigid ieinder, iender, yender, yeinder = frigidity, coolness
Cornish (Kernewek)	yey = ice yeyn = cold yeynder = cold yeynell, yeyner = fridge yeynhe = to chill, become cold
Middle Breton (Brezoneg)	yen = cold
Breton (Brezhoneg)	yen = cold yenaat = to cool down, relax yenadur = coolness, cooling, chill yenañ = to cool, refrigerate, detach yender = cold, coolness

Etymology from the Proto-Indo-European *h₁yeg- (ice, frost), which is also the root of the English word icicle [source].

Proto-Celtic	*ougros = cold
Gaulish	Ogronnios = personal name
Old Irish (Goídelc)	úar [uːa̯rʲ] = cold úacht = cold, coldness
Middle Irish (Gaoidhealg)	úar = cold, cool. refreshing, unfriendly ind(ḟ)úar = very cold, chilly, cool, refreshing, pleasing, entertaining úacht, ócht, ocht = cold, coldness, numbness
Irish (Gaeilge)	fuar [fˠuəɾˠ] = cold, apathetic, raw, uncooked fuaraigh = to cool, make cold, chill, relieve, pass (away) fuaráil = coolness, indifference, reserve fuaraíocht = coldness, chilliness fuarálach = cold, indifferent, reserved fuacht = cold, chill, apathy fuachtán = chilblain
Scottish Gaelic (Gàidhlig)	fuar [fuər] = cold fuarachd [fuərəxg] = coldness, chilliness, chilblain, mildew, dampness fuarachdainn [fuərəxgɪn̪ʲ] = cooling, easing, relieving fuaradair [fuərədɪrʲ] = fridge, refrigerator fuaraichte [fuərɪçdʲə] = cooled, refrigerated, eased, relieved fuarail [fuəral] = chilly, chilling fuaralachd [fuərəl̪ˠəxg] = coldness, frigidity
Manx (Gaelg)	feayr = chill, cold, cool, frigid, frosty, ice, distant (of person) feayght = chill, cold, exposure feayraghey = chill, cool, refrigerate, alienation feayraght = chill, cold, coldness feayrit = chilled, cooled, refrigerated
Middle Welsh (Kymraec)	oir, oer = cold, cool oerai, oeri = to make/become/grow cold or cool oyrder = cold(ness), cool(ness), chill, indifference, apathy oered = coldness, chill oervel, oeruel = cold(ness), chill
Welsh (Cymraeg)	oer [jaː] = cold, cool, sad, dejected, miserable, coldness, child, cold vegetables, fruit and salad oeraf, oeri = to make/become/grow cold or cool, lose zeal, become depressed oeraidd = rater cold, coolish, coldish, chilly, unenthusiastic, apathetic, indifferent oerder = cold(ness), cool(ness), chill, indifference, apathy oeredd = coldness, chill oerfa = cool place, shade oerfel = cold(ness), chill oergell = refrigerator, freezer, cold cell
Middle Cornish (Cernewec)	oir = cold, frigid
Cornish (Kernewek)	oor = bitterly cold, glacial, icy

Etymology from the Proto-Indo-European *h₃ewǵ- (cold), which is also the root of the Lithuanian word aušti (cold) [source].

Another word for ice in Breton is skorn – etymology unknown.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Lexicon Cornu-britannicum: A Dictionary of the Ancient Celtic Language of Cornwall, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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