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betula pendula |
betula populifolia |
betula pubescens |
betulaceae |
betulaceous |
betulin
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betulin
CIDE DICTIONARY
betulin, n. [L. betula birch tree.].
a term originally applied to a substance obtained as a resin or tar by extraction from the outer bark of the common European white birch (Betula alba ); now referring to the chemical compound (C30H50O2 ) having a cyclopentanophenanthrene ring system, which is the main constituent of that extract, and which may be obtained crystalline; -- called also birch camphor . Watts. [1913 Webster]
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