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Definition of castor:

  1. A genus of rodents, including the beaver. See Beaver.
  2. A hat, esp. one made of beaver fur; a beaver.
  3. A heavy quality of broadcloth for overcoats.
  4. Alt. of Castorite
  5. Castoreum. See Castoreum.
  6. See Caster, a small wheel.
  7. the northernmost of the two bright stars in the constellation Gemini, the other being Pollux.


silk hat, caster, beaver fur, stovepipe, top hat, high hat, genus Castor, opera hat, beaver, topper, Alpha Geminorum, dress hat.

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