| methamphetamine | <chemical> A central nervous system stimulant and sympathomimetic with actions and uses similar to dextroamphetamine. The smokable form is a drug of abuse and is referred to as crank, crystal, crystal meth, ice, and speed. Pharmacological action: adrenergic agents, adrenergic uptake inhibitors, appetite depressants, central nervous system stimulants, dopamine agents, dopamine uptake inhibitors, sympathomimetic. Chemical name: Benzeneethanamine, N,alpha-dimethyl-, (S)- (12 Dec 1998) |
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| methamphetamine base | A form of methamphetamine that can be readily volatilised. (05 Mar 2000) |
| methamphetamine hydrochloride | D-Desoxyephedrine hydrochloride; d-N,alpha-dimethylphenethylamine hydrochloride, "speed";a sympathomimetic agent that exerts greater stimulating effects upon the central nervous system than does amphetamine; widely used by drug abusers via the oral and intravenous ("mainlining") routes; strong psychic dependence may develop. Synonym: methylamphetamine hydrochloride. (05 Mar 2000) |
| chiral crystal | An enantiomorphic, dyssymmetric, optically active crystal. (05 Mar 2000) |
| phase, crystal | <microscopy> A specific crystal structure, usually given a name. (05 Aug 1998) |
| clathrate crystal | Lattice-like arrangement of molecules of one substance surrounding molecules of another substance. (05 Mar 2000) |
| crystal | 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. Origin: G. Krystallos, clear ice, crystal (05 Mar 2000) |
| crystal, birefringent | <microscopy> A crystalline substance which is anisotropic with respect to the velocity of light. (05 Aug 1998) |
| crystal rash | A noninflammatory form of miliaria in which the vesicles are filled with clear fluid. Synonym: crystal rash, sudamina. (05 Mar 2000) |
| crystal structure | <chemistry> The configuration in which atoms are arranged in a material. These arrangements have a direct effect on the physical properties of the material. These arrangements commonly take the form of cubes, rectangular solids, hexagonal solids. Etc. (05 Aug 1998) |
| crystal violet | Hexamethylpararosanilin chloride;a compound that has been used in the external treatment of burns, wounds, and fungal infections of skin and mucous membranes, and internally for pinworm and certain fluke infections; used also as a stain for chromatin, amyloid, platelets in blood, fibrin, and neuroglia, and to differentiate among bacteria. Synonym: methylrosaniline chloride. (05 Mar 2000) |
| crystal violet vaccine | See: hog cholera vaccines. (05 Mar 2000) |
| hydrate crystal | One of several possible microstructural arrangements of water molecules based on intermolecular forces; suggested as being involved in the mode of action of inhalation anaesthetics. (05 Mar 2000) |
| sperm crystal | A crystal of spermin phosphate found in the semen; possibly identical to Bottcher's crystal's. (05 Mar 2000) |
| negative crystal | <microscopy> A uniaxial crystal is optically negative if epsilon is less than omega A biaxial crystal is said to be optically negative if gamma minus beta is less than beta is less than beta minus alpha. Otherwise the crystal is positive. (05 Aug 1998) |