- One who rocks; specifically, one who rocks a cradle.
- One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.
- Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
- A play horse on rockers; a rocking-horse.
- A chair mounted on rockers; a rocking-chair.
- A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
- Same as Rock shaft.