Rŏck'er, n.

n. 1. One who rocks the cradle.

It was I, sir, said the rocker, who had the honor, some thirty years since, to attend on your highness in your infancy. Fuller.

2Sense 2. The curving piece of wood on which a cradle or chair rocks.

3Sense 3. Any implement capable of a rocking motion; as, a rocker for separating gold-dust from gravel, &c.