Betulin
Pronunciation : Bet"u*lin
Part of Speech : n.
Etymology : [L. betula birch tree.] (Chem.)
Definition : Defn: A substance of a resinous nature, obtained from the outer bark of the common European birch (Betula alba), or from the tar prepared therefrom; -- called also birch camphor. Watts.
Source : Webster's Unabridged Dictionary, 1913