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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.