crystal

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crystal

 [kris´t'l]
a homogeneous angular solid of definite form, with systematically arranged elemental units.
hydroxyapatite crystal microscopic crystals of hydroxyapatite occurring in joints or bursae in a variety of connective tissue disorders.

crys·tal

(kris'tăl),
A solid of regular shape and, for a given compound, characteristic angles, formed when an element or compound solidifies slowly enough, as a result either of freezing from the liquid form or of precipitating out of solution, to allow the individual molecules to take up regular positions with respect to one another.
[G. krystallos, clear ice, crystal]

crystal

/crys·tal/ (kris´t'l) a homogeneous angular solid of definite form, with systematically arranged elemental units.
blood crystals  hematoidin crystals in the blood.
Charcot-Leyden crystals  elongated, diamond-shaped, birefringent crystals derived from disintegrating eosinophils, seen in serous fluids such as the bronchial secretions in asthma and in stools in some cases of intestinal parasitism.

crystal

[kris′təl]
Etymology: Gk, krystallos
a solid substance, either organic or inorganic, the atoms or molecules of which are arranged in a regular, repeating three-dimensional pattern, which determines the shape of a crystal. crystalline, adj.

crystal

Drug slang A popular term for a crystallized form of methamphetamine; PCP; amphetamine; cocaine Urology Kidney stone, see there Vox populi A formed structure, often composed of a single type of material, which has a characteristic appearance by LM. See Birefringent crystal, Calcium oxalate crystal, Charcot-Leyden crystal, Coffin lid crystal, Hemoglobin C crystal, Jackstraw crystal, Lead crystal, Parking lot crystal, Piezoelectric crystal, Reinke crystal, Rhomboid crystal, Space crystal, Uric acid crystal, Washington monument crystal.

crys·tal

(kris'tăl)
A solid of regular shape and, for any given compound, characteristic angles, formed when an element or compound solidifies slowly enough, as a result either of freezing from the liquid form or of precipitating out of solution, to allow the individual molecules to take up regular positions with respect to one another; can be seen in body fluids.
[G. krystallos, clear ice, crystal]

crystal,

n distinctive form of molecule created when an element or chemical compound is frozen or slowly solidified. Each element or compound has a unique structure often used in gem healing and in amulets of pendulum.

crys·tal

(kris'tăl)
A solid of regular shape and, for a given compound, characteristic angles, formed when an element or compound solidifies slowly enough, as a result either of freezing from the liquid form or of precipitating out of solution, to allow the individual molecules to take up regular positions with respect to one another.
[G. krystallos, clear ice, crystal]

crystal(s),

n a naturally produced solid. The ultimate units of the substance from which it was formed are arranged systematically.

crystal

a naturally produced angular solid of definite form.

crystal-associated hepatopathy
crystal-induced arthritis
piezoelectric crystal
the source of sound waves in ultrasonography.
radiographic c's
crystals on radiographs caused by faulty use of fixative, commonly excess acidity or insufficient washing of the film.
synovial crystal
tissue crystal
recognizable crystals in tissues occur in crystal-associated cholangiohepatopathy, zinc and oxalate poisoning.
urines c's
crystal violet
a brilliant organic deep purple dye.
crystal violet vaccine
an obsolete hog cholera (classical swine fever) vaccine.
References in periodicals archive ?
It is mostly composed of disintegrated Cambrian Ordovician sandy material, a minor admixture of the other target lithologies (rare fragments of Ordovician carbonate rocks, Lower Ordovician phosphate shell debris, and organic-rich Dictyonema shale), and Precambrian crystalline rocks.
Abiogenic methanogenesis in crystalline rocks,' Geochimica et Cosmochimica acta, 57:5087-5097, 1993.
Although the conductive nature of the upper portion of crystalline rocks has been suggested by previous modelling works, this study shows that the vertical conductivity is required to decrease up to 10 times compared to lateral conductivity in order to explain the observed TDS changes in pumping wells.
Carnegie researchers looked within crystalline rocks called KREEP (K for potassium; REE, for rare Earth elements; and P for phosphorus).
When the ODP scientists drilled into a level spot on the wall of the fracture zone valley, they found coarsely crystalline rocks called gabbros, which are known to make up the lower segment of the crust.
The work will be carried out for the needs of the EU project DOPAS, whose aim is to determine the feasibility of sealing the access and storage of galleries in future deep repository for RAW constructed in crystalline rocks.
The five advanced projects are all located in Precambrian crystalline rocks which are covered by 30 to 40 meters of loam.
Its aim is to experiment in an underground laboratory Josef verify the feasibility of sealing the access and storage tunnels in crystalline rocks using the proposed design plugs.
Both deposits are situated on and along the Debur deep fracture zone, a structure which marks the geologic boundary between crystalline rocks to the west and the Hailar basin to the east.
The third post-mortem evaluation of crystalline rocks after termination of the experiment.
These units vary from fine grained homogenous, non-magnetic crystalline rocks, to larger grained mesocratic units hosting 3 - 5 percent magnetite and demonstrating contact and flow foliation.