The Collaborative International Dictionary
Castorin
Castorin \Cas"to*rin\ (k[a^]s"t[-o]*r[i^]n), n. [From 1st Castor.] (Chem.) A white crystalline substance obtained from castoreum.
Wiktionary
castorin
n. (context organic compound English) A white crystalline substance obtained from castoreum.