'Castoreum' definitions:

Definition of 'Castoreum'

From: GCIDE

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. [1913 Webster]