(rok′ər) noun
1. One who or that which rocks, in any sense.
2. One of the curved pieces on which a rocking chair or a cradle rocks.
3. A rocking chair.
4. A rock shaft.
5. A rocking–horse.
6. Mining A cradle.
7. An ice skate having a curved runner.
8. A small steel plate with a serrated edge for preparing a copper plate for a mezzotint.

(rok′ər) noun
The rock dove.