rocker

Short definition from Wiktionary

Noun

1. 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. 2
   A rocking chair.
3. 3
   The lengthwise curvature of a surfboard. (More rocker is a more curved board.)
4. 4
   The breve below as in ḫ.
5. 5
   Someone passionate about rock music.
6. 6
   A musician who plays rock music.
7. 7
   A rock music song.
8. 8
   One who rocks something.
9. 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. 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. 11
    A tool with small teeth that roughens a metal plate to produce tonality in mezzotints.
12. 12
    A rocking horse.
13. 13
    A rocker board.
14. 14
    A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
15. 15
    A kind of electrical switch with a spring-loaded actuator.
16. 16
    A rock shaft.
17. 17
    A curved line accompanying the chevrons that denote rank, qualifying the rank with a grade.