Main entry: Castor, genus Castor
Definition: type genus of the Castoridae: beavers
Definition: a hat made with the fur of a beaver (or similar material)
Definition: a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
Definition: a shaker with a perforated top for sprinkling powdered sugar
Main entry: Castor, Alpha Geminorum
Definition: a multiple star with 6 components; second brightest in Gemini; close to Pollux