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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.

Synonyms:

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

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