Etymology
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caster (n.1)

also sometimes castor, "person or thing that casts," late 14c., agent noun from cast (v.). Meaning "pepper shaker, small perforated container" is from 1670s, on notion of "throwing" the powder, liquid, etc., when needed.

caster (n.2)

"small wheel and swivel attached to the leg of a piece of furniture," 1748, agent noun from cast (v.) in the old sense of "turn." Also sometimes castor.

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Definitions of caster

caster (n.)
a worker who casts molten metal into finished products;
caster (n.)
a shaker with a perforated top for sprinkling powdered sugar;
Synonyms: castor
caster (n.)
a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable;
Synonyms: castor
From wordnet.princeton.edu