(n.) One who rocks; specifically, one who rocks a cradle.
(n.) One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.
(n.) 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.
(n.) A play horse on rockers; a rocking-horse.
(n.) A chair mounted on rockers; a rocking-chair.
(n.) A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.