castŏrĕum, ei, n. [1. castor],
castor or castoreum , a secretion of the beaver having a strong odor , Plin. 8, 30, 47, § 109; Lucr. 6, 794; Cels. 6, 7, 8; Scrib. 3.—In plur., Verg. G. 1, 59; Plin. 32, 9, 31, § 101; Nemes. C. 224.
castoreum eī, n 1 castor, castoreum, a strong-smelling secretion of the beaver : virosa, V. ...
An Elementary Latin Dictionary
·noun A peculiar bitter orange-brown substance, with strong, penetrating odor, found in two sacs bet...
Webster's Dictionary of the English Language