From The Collaborative International Dictionary of English v.0.48:

Roc \Roc\, n. [Ar. & Per. rokh or rukh. Cf. Rook a castle.]
   A monstrous bird of Arabian mythology. [Written also rock,
   and rukh.] --Brande & C.
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From The Collaborative International Dictionary of English v.0.48:

Rock \Rock\, n.
   See Roc.
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From The Collaborative International Dictionary of English v.0.48:

Rock \Rock\, n. [OE. rocke; akin to D. rok, rokken, G. rocken,
   OHG. roccho, Dan. rok, Icel. rokkr. Cf. Rocket a firework.]
   A distaff used in spinning; the staff or frame about which
   flax is arranged, and from which the thread is drawn in
   spinning. --Chapman.
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         Sad Clotho held the rocke, the whiles the thread
         By grisly Lachesis was spun with pain,
         That cruel Atropos eftsoon undid.        --Spenser.
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From The Collaborative International Dictionary of English v.0.48:

Rock \Rock\, n. [OF. roke, F. roche; cf. Armor. roc'h, and AS.
   1. A large concreted mass of stony material; a large fixed
      stone or crag. See Stone.
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            Come one, come all! this rock shall fly
            From its firm base as soon as I.      --Sir W.
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   2. (Geol.) Any natural deposit forming a part of the earth's
      crust, whether consolidated or not, including sand, earth,
      clay, etc., when in natural beds.
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   3. That which resembles a rock in firmness; a defense; a
      support; a refuge.
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            The Lord is my rock, and my fortress. --2 Sam. xxii.
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   4. Fig.: Anything which causes a disaster or wreck resembling
      the wreck of a vessel upon a rock.
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   5. (Zool.) The striped bass. See under Bass.
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   Note: This word is frequently used in the formation of
         self-explaining compounds; as, rock-bound, rock-built,
         rock-ribbed, rock-roofed, and the like.
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   Rock alum. [Probably so called by confusion with F. roche a
      rock.] Same as Roche alum.

   Rock barnacle (Zool.), a barnacle (Balanus balanoides)
      very abundant on rocks washed by tides.

   Rock bass. (Zool.)
      (a) The stripped bass. See under Bass.
      (b) The goggle-eye.
      (c) The cabrilla. Other species are also locally called
          rock bass.

   Rock builder (Zool.), any species of animal whose remains
      contribute to the formation of rocks, especially the
      corals and Foraminifera.

   Rock butter (Min.), native alum mixed with clay and oxide
      of iron, usually in soft masses of a yellowish white
      color, occuring in cavities and fissures in argillaceous

   Rock candy, a form of candy consisting of crystals of pure
      sugar which are very hard, whence the name.

   Rock cavy. (Zool.) See Moco.

   Rock cod (Zool.)
      (a) A small, often reddish or brown, variety of the cod
          found about rocks andledges.
      (b) A California rockfish.

   Rock cook. (Zool.)
      (a) A European wrasse (Centrolabrus exoletus).
      (b) A rockling.

   Rock cork (Min.), a variety of asbestus the fibers of which
      are loosely interlaced. It resembles cork in its texture.

   Rock crab (Zool.), any one of several species of large
      crabs of the genus C, as the two species of the New
      England coast (Cancer irroratus and Cancer borealis).
      See Illust. under Cancer.

   Rock cress (Bot.), a name of several plants of the cress
      kind found on rocks, as Arabis petraea, Arabis lyrata,

   Rock crystal (Min.), limpid quartz. See Quartz, and under

   Rock dove (Zool.), the rock pigeon; -- called also {rock

   Rock drill, an implement for drilling holes in rock; esp.,
      a machine impelled by steam or compressed air, for
      drilling holes for blasting, etc.

   Rock duck (Zool.), the harlequin duck.

   Rock eel. (Zool.) See Gunnel.

   Rock goat (Zool.), a wild goat, or ibex.

   Rock hopper (Zool.), a penguin of the genus Catarractes.
      See under Penguin.

   Rock kangaroo. (Zool.) See Kangaroo, and Petrogale.

   Rock lobster (Zool.), any one of several species of large
      spinose lobsters of the genera Panulirus and
      Palinurus. They have no large claws. Called also {spiny
      lobster}, and sea crayfish.

   Rock meal (Min.), a light powdery variety of calcite
      occuring as an efflorescence.

   Rock milk. (Min.) See Agaric mineral, under Agaric.

   Rock moss, a kind of lichen; the cudbear. See Cudbear.

   Rock oil. See Petroleum.

   Rock parrakeet (Zool.), a small Australian parrakeet
      (Euphema petrophila), which nests in holes among the
      rocks of high cliffs. Its general color is yellowish olive
      green; a frontal band and the outer edge of the wing
      quills are deep blue, and the central tail feathers bluish

   Rock pigeon (Zool.), the wild pigeon (Columba livia) Of
      Europe and Asia, from which the domestic pigeon was
      derived. See Illust. under Pigeon.

   Rock pipit. (Zool.) See the Note under Pipit.

   Rock plover. (Zool.)
      (a) The black-bellied, or whistling, plover.
      (b) The rock snipe.

   Rock ptarmigan (Zool.), an arctic American ptarmigan
      (Lagopus rupestris), which in winter is white, with the
      tail and lores black. In summer the males are grayish
      brown, coarsely vermiculated with black, and have black
      patches on the back.

   Rock rabbit (Zool.), the hyrax. See Cony, and Daman.

   Rock ruby (Min.), a fine reddish variety of garnet.

   Rock salt (Min.), cloride of sodium (common salt) occuring
      in rocklike masses in mines; mineral salt; salt dug from
      the earth. In the United States this name is sometimes
      given to salt in large crystals, formed by evaporation
      from sea water in large basins or cavities.

   Rock seal (Zool.), the harbor seal. See Seal.

   Rock shell (Zool.), any species of Murex, Purpura, and
      allied genera.

   Rock snake (Zool.), any one of several large pythons; as,
      the royal rock snake (Python regia) of Africa, and the
      rock snake of India (Python molurus). The Australian
      rock snakes mostly belong to the allied genus Morelia.

   Rock snipe (Zool.), the purple sandpiper ({Tringa
      maritima}); -- called also rock bird, rock plover,
      winter snipe.

   Rock soap (Min.), a kind of clay having a smooth, greasy
      feel, and adhering to the tongue.

   Rock sparrow. (Zool.)
      (a) Any one of several species of Old World sparrows of
          the genus Petronia, as Petronia stulla, of Europe.
      (b) A North American sparrow (Pucaea ruficeps).

   Rock tar, petroleum.

   Rock thrush (Zool.), any Old World thrush of the genus
      Monticola, or Petrocossyphus; as, the European rock
      thrush (Monticola saxatilis), and the blue rock thrush
      of India (Monticola cyaneus), in which the male is blue

   Rock tripe (Bot.), a kind of lichen ({Umbilicaria
      Dillenii}) growing on rocks in the northen parts of
      America, and forming broad, flat, coriaceous, dark fuscous
      or blackish expansions. It has been used as food in cases
      of extremity.

   Rock trout (Zool.), any one of several species of marine
      food fishes of the genus Hexagrammus, family Chiradae,
      native of the North Pacific coasts; -- called also {sea
      trout}, boregat, bodieron, and starling.

   Rock warbler (Zool.), a small Australian singing bird
      (Origma rubricata) which frequents rocky ravines and
      water courses; -- called also cataract bird.

   Rock wren (Zool.), any one of several species of wrens of
      the genus Salpinctes, native of the arid plains of Lower
      California and Mexico.
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From The Collaborative International Dictionary of English v.0.48:

Rock \Rock\, v. t. [imp. & p. p. Rocked;p. pr. & vb. n.
   Rocking.] [AS. roccian; akin to Dan. rokke to move, to
   snake; cf. Icel. rukkja to pull, move, G. r["u]cken to move,
   push, pull.]
   1. 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.
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            A rising earthquake rocked the ground. --Dryden.
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   2. To move as in a cradle; hence, to put to sleep by rocking;
      to still; to quiet. "Sleep rock thy brain." --Shak.
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   Note: Rock differs from shake, as denoting a slower, less
         violent, and more uniform motion, or larger movements.
         It differs from swing, which expresses a vibratory
         motion of something suspended.
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From The Collaborative International Dictionary of English v.0.48:

Rock \Rock\, v. i.
   1. To move or be moved backward and forward; to be violently
      agitated; to reel; to totter.
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            The rocking town
            Supplants their footsteps.            --J. Philips .
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   2. To roll or saway backward and forward upon a support; as,
      to rock in a rocking-chair.
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From The Collaborative International Dictionary of English v.0.48:

Crack \Crack\, n.
   1. A partial separation of parts, with or without a
      perceptible opening; a chink or fissure; a narrow breach;
      a crevice; as, a crack in timber, or in a wall, or in
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   2. Rupture; flaw; breach, in a moral sense.
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            My love to thee is sound, sans crack or flaw.
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   3. A sharp, sudden sound or report; the sound of anything
      suddenly burst or broken; as, the crack of a falling
      house; the crack of thunder; the crack of a whip.
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            Will the stretch out to the crack of doom? --Shak.
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   4. The tone of voice when changed at puberty.
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            Though now our voices
            Have got the mannish crack.           --Shak.
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   5. Mental flaw; a touch of craziness; partial insanity; as,
      he has a crack.
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   6. A crazy or crack-brained person. [Obs.]
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            I . . . can not get the Parliament to listen to me,
            who look upon me as a crack and a projector.
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   7. A boast; boasting. [Obs.] "Crack and brags." --Burton.
      "Vainglorius cracks." --Spenser.
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   8. Breach of chastity. [Obs.] --Shak.
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   9. A boy, generally a pert, lively boy. [Obs.]
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            Val. 'T is a noble child. Vir. A crack, madam.
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   10. A brief time; an instant; as, to be with one in a crack.
       [Eng. & Scot. Colloq.]
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   11. Free conversation; friendly chat. [Scot.]
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             What is crack in English? . . . A crack is . . . a
             chat with a good, kindly human heart in it. --P. P.
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   12. a witty remark; a wisecrack.

   13. a chance or opportunity to do something; an attempt; as,
       I'll take a crack at it.

   14. a form of cocaine, highly purified and prepared as small
       pellets, especially suitable for smoking; -- also called
       rock. Used in this form it appears to be more addicting
       than cocaine powder. [slang]
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