Meaning

noun a multiple star with 6 components; second brightest in Gemini; close to Pollux

noun a shaker with a perforated top for sprinkling powdered sugar

noun a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable

originFrom Middle French castor, from Old French castor (“beaver”), from Latin castor (“beaver”), from Ancient Greek κάστωρ (kástōr), from Doric Greek κάστον (káston, “wood”).

Etymology from Wiktionary, CC BY-SA 3.0