Definitions for "Castoreum"
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.
The mountain men or fur trappers used castoreum to bait their beaver traps. This musky-scented oil is secreted from the castor gland of a beaver.
Musky secretion of beavers.