| crystal rash | A noninflammatory form of miliaria in which the vesicles are filled with clear fluid. Synonym: crystal rash, sudamina. (05 Mar 2000) |
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| 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) |
| 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) |
| twin crystal | Two crystal's that have grown together along a common face. (05 Mar 2000) |
| knife-rest crystal | A crystal of ammoniomagnesium phosphate found in alkaline urine. (05 Mar 2000) |
| acellular vaccine | <immunology, pharmacology, virology> Vaccine consisting of antigenic parts of cells. (13 Nov 1997) |
| adjuvant vaccine | A vaccine that contains an adjuvant; most often the antigen (immunogen) is included in a water-in-oil emulsion (Freund incomplete type adjuvant), or is adsorbed onto an inorganic gel (alum, aluminum hydroxide or phosphate). (05 Mar 2000) |
| aqueous vaccine | A vaccine having a liquid vehicle (e.g., physiological salt solution) as distinguished from an emulsion. (05 Mar 2000) |
| attenuated vaccine | Live pathogens that have lost their virulence but are still capable of inducing a protective immune response to the virulent forms of the pathogen, e.g., Sabin polio vaccine. (05 Mar 2000) |
| autogenous vaccine | A vaccine made from a culture of the patient's own bacteria. (05 Mar 2000) |
| bacillus Calmette-Guerin vaccine | <drug> Live attenuated vaccine for tuberculosis. For groups and health care workers in high endemic areas. Not to be given to individuals with HIV infection. (15 Nov 1997) |
| BCG vaccine | <drug> Live attenuated vaccine for tuberculosis. For groups and health care workers in high endemic areas. Not to be given to individuals with HIV infection. (15 Nov 1997) |
| brucella strain 19 vaccine | A live bacterial vaccine prepared from an attenuated variant strain of Brucella abortus (strain 19); used for vaccinating cattle against brucellosis. (05 Mar 2000) |