Noun
- 1. Castor, Alpha Geminorum
- usage: a multiple star with 6 components; second brightest in Gemini; close to Pollux
- 2. caster, castor, shaker
- usage: a shaker with a perforated top for sprinkling powdered sugar
- 3. caster, castor, roller
- usage: a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
- 4. beaver, castor, fur hat
- usage: a hat made with the fur of a beaver (or similar material)
- 5. Castor, genus Castor, mammal genus
- usage: type genus of the Castoridae: beavers
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