[1] : The Collaborative International Dictionary of English v.0.48

rock \rock\, n. of. roke, f. roche; cf. armor. roc'h, and as.
   rocc.
   1. a large concreted mass of stony material; a large fixed
      stone or crag. see stone.
      1913 webster

            come one, come all this rock shall fly
            from its firm base as soon as i.      --sir w.
                                                  scott.
      1913 webster

   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.
      1913 webster

   3. that which resembles a rock in firmness; a defense; a
      support; a refuge.
      1913 webster

            the lord is my rock, and my fortress. --2 sam. xxii.
                                                  2.
      1913 webster

   4. fig.: anything which causes a disaster or wreck resembling
      the wreck of a vessel upon a rock.
      1913 webster

   5. zool. the striped bass. see under bass.
      1913 webster

   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.
         1913 webster

   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
      slate.

   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,
      etc.

   rock crystal min., limpid quartz. see quartz, and under
      crystal.

   rock dove zool., the rock pigeon; -- called also rock
      doo.

   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
      green.

   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
      throughout.

   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.
      1913 webster
see also:
stone bass rock alum roche alum rock barnacle balanus balanoides 
rock bass rock builder rock butter rock candy rock cavy 
moco rock cod rock cook centrolabrus exoletus rock cork 
rock crab c cancer irroratus cancer borealis cancer 
rock cress arabis petraea arabis lyrata rock crystal quartz 
crystal rock dove rock doo rock drill rock duck 
rock eel gunnel rock goat rock hopper catarractes 
penguin rock kangaroo kangaroo petrogale rock lobster 
panulirus palinurus spiny lobster sea crayfish rock meal 
rock milk agaric mineral agaric rock moss cudbear 
rock oil petroleum rock parrakeet euphema petrophila rock pigeon 
columba livia pigeon rock pipit pipit rock plover 
rock ptarmigan lagopus rupestris rock rabbit cony daman 
rock ruby rock salt rock seal seal rock shell 
rock snake rock snake python regia python molurus morelia 
rock snipe tringa maritima rock bird rock plover winter snipe 
rock soap rock sparrow petronia petronia stulla pucaea ruficeps 
rock tar rock thrush monticola petrocossyphus monticola saxatilis 
monticola cyaneus rock tripe umbilicaria dillenii rock trout hexagrammus 
chiradae sea trout boregat bodieron starling 
rock warbler origma rubricata cataract bird rock wren salpinctes 

[2] : The Collaborative International Dictionary of English v.0.48

crystal \crys"tal\ kri^s"tal, n. oe. cristal, f. cristal,
   l. crystallum crystal, ice, fr. gr. kry`stallos, fr. kry`os
   icy cold, frost; cf. as. crystalla, fr. l. crystallum; prob.
   akin to e. crust. see crust, raw.
   1. chem.  min. the regular form which a substance tends to
      assume in solidifying, through the inherent power of
      cohesive attraction. it is bounded by plane surfaces,
      symmetrically arranged, and each species of crystal has
      fixed axial ratios. see crystallization.
      1913 webster

   2. the material of quartz, in crystallization transparent or
      nearly so, and either colorless or slightly tinged with
      gray, or the like; -- called also rock crystal.
      ornamental vessels are made of it. cf. smoky quartz,
      pebble; also brazilian pebble, under brazilian.
      1913 webster

   3. a species of glass, more perfect in its composition and
      manufacture than common glass, and often cut into
      ornamental forms. see flint glass.
      1913 webster

   4. the glass over the dial of a watch case.
      1913 webster

   5. anything resembling crystal, as clear water, etc.
      1913 webster

            the blue crystal of the seas.         --byron.
      1913 webster

   blood crystal. see under blood.

   compound crystal. see under compound.

   iceland crystal, a transparent variety of calcite, or
      crystallized calcium carbonate, brought from iceland, and
      used in certain optical instruments, as the polariscope.
      

   rock crystal, or mountain crystal, any transparent
      crystal of quartz, particularly of limpid or colorless
      quartz.
      1913 webster
see also:
crust raw crystallization rock crystal smoky quartz pebble 
brazilian pebble brazilian flint glass blood crystal blood 
compound crystal compound iceland crystal rock crystal mountain crystal 

[3] : WordNet (r) 2.0

rock crystal
     n : a clear quartz used in making electronic and optical
         equipment syn: transparent quartz
see also:
transparent quartz 

Crystal >> C Words
Crystal, definition of term: Crystal
crystal_pag1.html

Crystal Lattice >> C Words
Crystal Lattice, definition of term: Crystal Lattice
crystal+lattice_pag1.html

Crystal Glass >> C Words
Crystal Glass, definition of term: Crystal Glass
crystal+glass_pag1.html