a genus of trees and shrubs (family Betulaceae) of arctic and temperate regions of the northern hemisphere comprising the birches and including one (B. lenta) which is the source of birch oil
betula
noun(Bet-u-la)
birch oil
betula
noun(Bet-u-la)
an essential oil that consists chiefly of methyl salicylate and is obtained from the bark and twigs of the sweet birch (Betula lenta) —called also betula oil, sweet-birch oil