Words for birch (tree) (Betula) in Celtic languages:
| Proto-Celtic | *betwiyos / *betuyā = birch (tree) |
|---|---|
| Old Irish (Goídelc) | beithe = birch (tree) |
| Irish (Gaeilge) | beith = birch (tree) |
| Scottish Gaelic (Gàidhlig) | beith [beh] = birch |
| Manx (Gaelg) | beih = birch (tree) |
| Proto-Brythonic | *bedu = birch (tree) |
| Middle Welsh (Kymraec) | bedw = birch |
| Welsh (Cymraeg) | bedw [ˈbɛdʊ / ˈbeːdu] = birch, birch grove; maypole; birch-rod |
| Old Cornish | bedewen = birch |
| Cornish (Kernewek) | besewen = birch |
| Middle Breton | bezu = birch |
| Breton (Brezhoneg) | bezv = birch |
Etymology: from the Proto-Indo-European *gʷet- (resin, gum) [source], which is also the root of the English words cud and quid.
Words marked with a * are reconstructions.
Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau
