| betulin | <chemistry> A substance of a resinous nature, obtained from the outer bark of the common European birch (Betula alba), or from the tar prepared therefrom. Synonym: birch camphor. Origin: L. Betula birch tree. Source: Websters Dictionary (01 Mar 1998) |
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| betulinic acid | This pentacyclic terpene isfound in the bark of birch trees, especially the white birch (Betula alba). It is currently beinginvestigated as a treatment for malignant melanoma. (09 Oct 1997) |