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noun Betulin n. (Chem.) 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.
Collaborative International Dictionary of English 0.48
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