- caster (n.1)
- "person or thing that casts," late 14c. (also sometimes castor), agent noun from cast (v.). Meaning "pepper shaker, small perforated container" is from 1670s, on notion of "throwing."
- caster (n.2)
- "wheel and swivel attached to furniture," 1748, agent noun from cast (v.) in the old sense of "turn." Also sometimes castor.