1. One who rocks; specifically, one who rocks a cradle.
  2. One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.
  3. 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.
  4. A play horse on rockers; a rocking-horse.
  5. A chair mounted on rockers; a rocking-chair.
  6. A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
  7. Same as Rock shaft.