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Definition of: castor
(kas′tər, käs′-) noun
1. A beaver, or its fur.
2. A hat of beaver or other fur; also, a silk hat.
3. An oily odorous secretion of beavers: used in medicine and perfumery: also cas·to·re·um (kas·tôr′ē·əm, -tō′rē·əm). [<L <Gk. kastōr beaver]
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