Castoreum
Pronunciation : Cas*to"re*um
Part of Speech : n.
Etymology : [L. See Castor.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913