Bet″u‐lin (�), n. [L. betula birch tree.] (Chem.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.