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Webster's 1828 Dictionary

CASTORIN, CASTORINE

n.An animal principle discovered in castor, and prepared by boiling castor in six times its weight of alcohol, and filtering the liquor. From this is deposited the Castorin.

 

Webster's 1913 Dictionary

CASTORIN

Cas "to *rin, n. Etym: [From 1st Castor. ] (Chem. )

 

Defn: A white crystalline substance obtained from castoreum.