Words for ears in Celtic languages.

Proto-Celtic	*kloustā = ear
Old Irish (Goídelc)	clúas = ear, hearing
Irish (Gaeilge)	cluas [klˠuəsˠ] = ear; ear-shaped object; lug, handle; cleat; tab; corner, margin
Scottish Gaelic (Gàidhlig)	cluas [kl̪ˠuəs] = ear, lug; handle; clew (of a sail) ; flyer bearing (of a spinning wheel)
Manx (Gaelg)	cleaysh [kleːʃ] = ear, cleat, handle, lug, top corner of net, corner of sail
Proto-Brythonic	*klʉst = ear
Welsh (Cymraeg)	clust [klɨːst / klɪst] = ear, sense of hearing, attention, willingness to listen; handle of a vessel, tag of a boot, top part of a bell; creek or inlet; auricle (of the heart)

Etymology: from Proto-Indo-European *ḱlow-steh₂, from *ḱlew- (to hear) [source].

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

Welsh (Cymraeg)	ysgyfarn = ear
Old Cornish	scouarn = ear
Cornish (Kernewek)	skovarn [‘skɔvarn / ‘skɔvɐrn] = ear, handle (of jar)
Old Breton	scobarn = ear
Breton (Brezhoneg)	skouarn [skwaʁn] = ear; gills; handle (of vase); moldboard (of plow)

Sources: Wiktionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Words marked with a * are reconstructions.