| catadicrotic pulse | A catacrotic pulse in which there are two interrupting upward notches. Synonym: pulsus catadicrotus. (05 Mar 2000) |
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| catadicrotism | A condition of the pulse marked by two minor expansions of the artery following the main beat, producing two secondary upward waves on the downstroke of the pulse tracing. Origin: cata + G. Di-, two, + krotos, beat (05 Mar 2000) |
| catadidymus | Synonym: duplicitas anterior. Origin: cata-+ G. Didymus, twin (05 Mar 2000) |
| catadioptric | <optics> An optical system in which both reflecting and refracting curved surfaces are used to form an image. Some reflecting objective lenses, as well as video projection systems, are catadioptric, the latter uses a Schmidt plate to correct the spherical aberration introduced by the spherical reflecting mirror. (16 Mar 1998) |
| catagen | A regressing phase of the hair growth cycle during which cell proliferation ceases, the hair follicle shortens, and an anchored club hair is produced. (05 Mar 2000) |
| catagenesis | <ecology> Evolutionary change toward simpler, more general forms, and away from complex forms which are highly-specialised for a particular set of environmental conditions. (16 Mar 1998) |
| catalase | <enzyme> Tetrameric haem enzyme (245 kD) that breaks down hydrogen peroxide. (18 Nov 1997) |
| catalatic reaction | Decomposition of H2O2 to O2 and H2O, as in the action of catalase; analogous to peroxidase reaction. (05 Mar 2000) |
| catalepsy | Sustained immobility of postures or physical attitude. (12 Dec 1998) |
| cataleptic | Relating to, or suffering from, catalepsy. (05 Mar 2000) |
| cataleptoid | Simulating or resembling catalepsy. (05 Mar 2000) |
| catalogia | Constant repetition of meaningless words or phrases; seen in schizophrenia. Synonym: catalogia, cataphasia, oral stereotypy. Origin: L. Verbum, word, + gero, to carry about (05 Mar 2000) |
| catalogs | Ordered compilations of item descriptions and sufficient information to afford access to them. Files of bibliographic records, created according to specific and uniform principles of construction and under the control of an authority file, which describes the materials contained in a collection, library, or group of libraries. Catalogs include also lists of materials prepared for a particular purpose, such as exhibition catalogs, sales catalogs, garden catalogs, medical supply catalogs. (12 Dec 1998) |
| catalyse | <chemistry> To speed up a chemical reaction. (16 Mar 1998) |
| catalysis | <chemistry> The acceleration of a chemical reaction by a catalyst. (16 Mar 1998) |