/rok"euhr/ , n.
1. Also called runner . one of the curved pieces on which a cradle or a rocking chair rocks.
2. See rocking chair .
3. a rock-'n'-roll song: She sang a ballad and followed that with two of her well-known rockers.
4. any of various devices that operate with a rocking motion.
5. Graphic Arts. a small steel plate with one curved and toothed edge for roughening a copperplate to make a mezzotint.
6. Mining. cradle (def. 13).
7. an ice skate that has a curved blade.
8. a performer or fan of rock music.
9. off one's rocker , Slang. insane; crazy: You're off your rocker if you think I'm going to climb that mountain.
[ 1400-50; late ME: one who rocks a cradle; see ROCK 2 , -ER 1 ]