genus associated with the birches, from Latin betula "birch," from Gaulish betu- "bitumen" (cognates: Middle Irish beithe "box tree," Welsh bedwen "birch tree"). Relating to Pliny, so called because Gauls extracted tar from birches. Birch-tar remains sold as an analgesic and stimulant and made into birch beer by the Pennsylvania Dutch.
a genus of woods of the household Betulaceae (eg birches)
Reticulate and Betula nana.