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