n. The rock-dove, Columba livia. Montagu. Also rockier, rock.n. One who or that which rocks.n. The curved piece of wood on which a cradle or rocking-chair rocks.n. A rocking-horse.n. A rocking-chair.n. In engraving, same as cradle, 4 .n. A rocker-shaft.n. In mining, same as cradle 4 .n. In an electric-lamp regulator, a lever, pivoted in the middle, carrying at its extremities the armatures of two electromagnets, by the alternate attraction of which the carbon rods are made to separate or to approach each other.n. A boat or yacht having a rocker keel.n. A skate in which the bottom of the runner is not straight, but is convex from toe to heel.n. A vessel for freezing chemical mixtures, essentially a freezer mounted on rockers.n. In a railway gravel tip-car, a curved iron casting which supports the car-body, and on which the body rocks when the load is dumped.n. One of two beams used in the body-frame of a carriage to support the floor-boards. See cut under barouche.n. In pianoforte-making, the piece screwed to a key-tail to which the action-extension is fastened.n. A tanning-vat in which the hides are rocked at intervals to facilitate tanning.