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1. A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft. 2. An oscillating bar in a machine, as the lever of the bellows of a forge. 3. See Roc. 4. A distaff used in spinning; the staff or frame about which flax is arranged, and from which the thread is drawn in spinning. 5. A large concreted mass of stony material; a large fixed stone or crag. See Stone. 6. Any natural deposit forming a part of the earth's crust, whether consolidated or not, including sand, earth, clay, etc., when in natural beds. 7. That which resembles a rock in firmness; a defense; a support; a refuge. 8. Fig.: Anything which causes a disaster or wreck resembling the wreck of a vessel upon a rock. 9. The striped bass. See under Bass. 10. To cause to sway backward and forward, as a body resting on a support beneath; as, to rock a cradle or chair; to cause to vibrate; to cause to reel or totter. 11. To move as in a cradle; hence, to put to sleep by rocking; to still; to quiet. 12. To move or be moved backward and forward; to be violently agitated; to reel; to totter. 13. To roll or saway backward and forward upon a support; as, to rock in a rocking-chair. 14. pitching dangerously to one side 
Related wordsachondrite aphanite bedrock boulder calculus caliche cant careen chondrite clastic rock claystone crystal dolomite emery stone fieldstone good person gravel greisen gynecologist igneous rock intrusion lean limestone lurch magma marble material metamorphic rock mineral move move back and forth natural object nutate outcrop pebble petrifaction pudding stone pumice quartzite road metal rock rocker rocking chair rocky roll rough sedimentary rock shingling sial sill sima stagger stepping stone stone swag sway swing tor totter tufa wag wall rock whinstone xenolith |
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