Words for alder (tree) (Alnus glutinosa) in Celtic languages:
| Proto-Celtic | *wernā = alder (tree) |
|---|---|
| Gaulish | uerna = alder (tree) |
| Old Irish (Goídelc) | fern [fʲer͈n͈] = alder (tree), shield, pole, stake fernóc = alder (tree) |
| Irish (Gaeilge) | fearnóg = alder (tree) |
| Scottish Gaelic (Gàidhlig) | feàrna [fʲaːr͈n͈ə] = alder (tree), shield, mast |
| Manx (Gaelg) | farney = alder (tree) |
| Proto-Brythonic | *gwern = alder (tree) |
| Welsh (Cymraeg) | gwern [ɡwɛrn] = alder (tree), made of alder; mast of a ship; (alder) stick, stave, shaft of lance; alder-grove, alder-marsh, swamp, quagmire; damp meadow; hell |
| Old Cornish | guern = alder (tree) |
| Cornish (Kernewek) | gwern [ɡwɛrn] = alder (tree), alders, mast, swamp, marshland |
| Old Breton | guern / guaern = alder (tree) |
| Middle Breton | guern = alder (tree) |
| Breton (Brezhoneg) | gwern [ɡwɛrn] = alder (tree) |
Words marked with a * are reconstructions.
Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau
