- 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, c.]- Böttcher crystals small crystals observed microscopically in prostatic fluid that is treated with a drop or two of 1% solution of ammonium phosphate.- Charcot-Leyden crystals crystals in the shape of elongated double pyramids, formed from eosinophils, found in the sputum in bronchial asthma and in other exudates or transudates containing eosinophils. SYN: asthma crystals, Charcot-Neumann crystals, Charcot-Robin crystals, Leyden crystals.- clathrate c. latticelike arrangement of molecules of one substance surrounding molecules of another substance.- ear crystals SYN: otoliths.- Florence crystals brown rhombic crystals formed at the interface between a drop of Lugol solution and a drop of fluid that contains semen; not a specific test for the latter.- hydrate c. one of several possible microstructural arrangements of water molecules based on intermolecular forces; suggested as being involved in the mode of action of inhalation anesthetics.- sperm c., spermin c. a c. of spermin phosphate found in the semen; possibly identical to Böttcher crystals.- Teichmann crystals rhombic crystals of hemin; used in microscopic detection of blood. See hemin. SYN: chlorohemin crystals.- thorn apple crystals ammonium urate crystals in the shape of rounded bodies with many projecting points.- Virchow crystals yellow-brown, amber, or burnt orange crystals of hematoidin, frequently observed in extravasated blood in tissues.
* * *crys·tal 'kris-təl n1) a body that is formed by the solidification of a chemical element, a compound, or a mixture and has a regularly repeating internal arrangement of its atoms and often external plane faces2) ice (2) broadly methamphetamine in any form when used illicitlycrystal adj
* * *crys·tal (krisґtəl) [Gr. krystallos ice] a homogeneous angular solid formed from a chemical element, compound, or isomorphous mixture, having a definite form in which the ultimate units from which it is built up are systematically arranged.
Medical dictionary. 2011.