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  Dictionary Definition of castor

Castor
noun Astronomy the more northerly of the two bright stars in Gemini; Alpha Geminorum.
castor [1]
noun
1. Also, castoreum . a brownish unctuous substance with a strong, penetrating smell, secreted by certain glands in the groin of the beaver, used in medicine and perfumery.
2. a beaver (hat).
3. some similar hat.
4. a beaver.
[L, from Greek kástor beaver]