(1):

(n.) One who rocks; specifically, one who rocks a cradle.

(2):

(n.) One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.

(3):

(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.

(4):

(n.) A play horse on rockers; a rocking-horse.

(5):

(n.) A chair mounted on rockers; a rocking-chair.

(6):

(n.) A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.

(7):

(n.) Same as Rock shaft.