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Definition of Castor
1. Noun. A multiple star with 6 components; second brightest in Gemini; close to Pollux.
2. Noun. A shaker with a perforated top for sprinkling powdered sugar.
3. Noun. A pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable.
4. Noun. A hat made with the fur of a beaver (or similar material).
5. Noun. Type genus of the Castoridae: beavers.
Exact synonyms: Genus Castor
Generic synonyms: Mammal Genus
Group relationships: Castoridae, Family Castoridae
Member holonyms: Beaver
Generic synonyms: Mammal Genus
Group relationships: Castoridae, Family Castoridae
Member holonyms: Beaver
Definition of Castor
1. n. A genus of rodents, including the beaver. See Beaver.
2. n. See Caster, a small wheel.
3. n. the northernmost of the two bright stars in the constellation Gemini, the other being Pollux.
4. n. A variety of the mineral called petalite, from Elba.
Definition of Castor
1. caster [n -S] - See also: caster