noun

• A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth.
• A rocking chair.
• (surfing) The lengthwise curvature of a surfboard. (More rocker is a more curved board.)
• The breve below as in ḫ.
• Someone passionate about rock music.
• A musician who plays rock music.
• (informal) A rock music song.
• One who rocks something.
• (UK) A member of a British subculture of the 1960s, opposed to the mods, who dressed in black leather and were interested in 1950s music.
• Any implement or machine working with a rocking motion, such as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
• A tool with small teeth that roughens a metal plate to produce tonality in mezzotints.
• A rocking horse.
• A rocker board.
• A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
• A kind of electrical switch with a spring-loaded actuator.
• (engineering) A rock shaft.
• (military) A curved line accompanying the chevrons that denote rank, qualifying the rank with a grade.