rocker

noun

1. A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth.
2. A rocking chair.
3. The lengthwise curvature of a surfboard. (More rocker is a more curved board.)
4. The breve below as in ḫ.
5. Someone passionate about rock music.
6. A musician who plays rock music.
7. A rock music song.
8. One who rocks something.
9. A member of a British subculture of the 1960s, opposed to the mods, who dressed in black leather and were interested in 1950s music.
10. 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.
11. A tool with small teeth that roughens a metal plate to produce tonality in mezzotints.
12. A rocking horse.
13. A rocker board.
14. A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
15. A kind of electrical switch with a spring-loaded actuator.
16. A rock shaft.
17. A curved line accompanying the chevrons that denote rank, qualifying the rank with a grade.