Found 2 items, similar to Rock crystal.
English → English
Definition: rock crystal
n : a clear quartz used in making electronic and optical
equipment [syn: transparent quartz
English → English
Definition: Rock crystal
, 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
Come one, come all! this rock shall fly
From its firm base as soon as I. --Sir W.
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.
3. That which resembles a rock in firmness; a defense; a
support; a refuge.
The Lord is my rock, and my fortress. --2 Sam. xxii.
4. Fig.: Anything which causes a disaster or wreck resembling
the wreck of a vessel upon a rock.
5. (Zo["o]l.) The striped bass. See under Bass
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.
. [Probably so called by confusion with F. roche a
rock.] Same as Roche alum
(Zo["o]l.), a barnacle (Balanus balanoides
very abundant on rocks washed by tides.
(a) The stripped bass. See under Bass
(b) The goggle-eye.
(c) The cabrilla. Other species are also locally called
(Zo["o]l.), any species of animal whose
remains contribute to the formation of rocks, especially
the corals and Foraminifera.
(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
, a form of candy consisting of crystals of pure
sugar which are very hard, whence the name.
. (Zo["o]l.) See Moco
(a) A small, often reddish or brown, variety of the cod
found about rocks andledges.
(b) A California rockfish.
(a) A European wrasse (Centrolabrus exoletus
(b) A rockling.
(Min.), a variety of asbestus the fibers of which
are loosely interlaced. It resembles cork in its texture.
(Zo["o]l.), 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
(Bot.), a name of several plants of the cress
kind found on rocks, as Arabis petr[ae]a
, Arabis lyrata
(Min.), limpid quartz. See Quartz
, and under
(Zo["o]l.), the rock pigeon; -- called also rock doo
, an implement for drilling holes in rock; esp.,
a machine impelled by steam or compressed air, for
drilling holes for blasting, etc.
(Zo["o]l.), the harlequin duck.
. (Zo["o]l.) See Gunnel
(Zo["o]l.), a wild goat, or ibex.
(Zo["o]l.), a penguin of the genus
. See under Penguin
. (Zo["o]l.) See Kangaroo
, and Petrogale
(Zo["o]l.), any one of several species of
large spinose lobsters of the genera Panulirus
. They have no large claws. Called also spiny lobster
, and sea crayfish
(Min.), a light powdery variety of calcite
occuring as an efflorescence.
. (Min.) See Agaric mineral
, under Agaric
, a kind of lichen; the cudbear. See Cudbear
. See Petroleum
(Zo["o]l.), a small Australian parrakeet
), 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
(Zo["o]l.), the wild pigeon (Columba livia
Of Europe and Asia, from which the domestic pigeon was
derived. See Illust. under Pigeon
. (Zo["o]l.) See the Note under Pipit
(a) The black-bellied, or whistling, plover.
(b) The rock snipe.
(Zo["o]l.), an arctic American ptarmigan
), 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.
(Zo["o]l.), the hyrax. See Cony
, and Daman
(Min.), a fine reddish variety of garnet.
(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.
(Zo["o]l.), the harbor seal. See Seal
(Zo["o]l.), any species of Murex, Purpura, and
(Zo["o]l.), any one of several large pythons;
as, the royal rock snake
) of Africa, and
the rock snake
of India (Python molurus
Australian rock snakes mostly belong to the allied genus
(Zo["o]l.), the purple sandpiper (Tringa maritima
); -- called also rock bird
, rock plover
(Min.), a kind of clay having a smooth, greasy
feel, and adhering to the tongue.
(a) Any one of several species of Old World sparrows of
the genus Petronia
, as Petronia stulla
, of Europe.
(b) A North American sparrow (Puc[ae]a ruficeps
(Zo["o]l.), any Old World thrush of the genus
, or Petrocossyphus
; as, the European rock
thrush (Monticola saxatilis
), and the blue rock thrush
of India (Monticola cyaneus
), in which the male is blue
(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
(Zo["o]l.), any one of several species of marine
food fishes of the genus Hexagrammus
, native of the North Pacific coasts; --
called also sea trout
(Zo["o]l.), a small Australian singing bird
) which frequents rocky ravines and
water courses; -- called also cataract bird
(Zo["o]l.), any one of several species of wrens
of the genus Salpinctes
, native of the arid plains of
Lower California and Mexico.
(kr[i^]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
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
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
; also Brazilian pebble
, under Brazilian
3. A species of glass, more perfect in its composition and
manufacture than common glass, and often cut into
ornamental forms. See Flint glass
4. The glass over the dial of a watch case.
5. Anything resembling crystal, as clear water, etc.
The blue crystal of the seas. --Byron.
. See under Blood
. See under Compound
, a transparent variety of calcite, or
crystallized calcium carbonate, brought from Iceland, and
used in certain optical instruments, as the polariscope.
, or Mountain crystal
, any transparent
crystal of quartz, particularly of limpid or colorless