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birch camphor | Betulin \Bet"u*lin\, n. [L. betula birch tree.] (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}. --Watts. [1913 Webster +PJC] |
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