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castoreum |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Castoreum \Cas*to"re*um\, n. [L. See {Castor}.] A peculiar bitter orange-brown substance, with strong, penetrating odor, found in two sacs between the anus and external genitals of the beaver; castor; -- used in medicine as an antispasmodic, and by perfumers.