| catacrotic pulse | A pulse in which there is an upward notch interrupting the descending limb of the sphygmogram. Synonym: pulsus catacrotus. (05 Mar 2000) |
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| catacrotism | A condition of the pulse in which there are one or more secondary expansions of the artery following the main beat, producing secondary upward waves on the downstroke of the pulse tracing. Origin: cata-+ G. Krotos, beat (05 Mar 2000) |
| catadicrotic | Denoting a pulse tracing in which there are two minor elevations interrupting the downstroke. (05 Mar 2000) |
| catadicrotic pulse | A catacrotic pulse in which there are two interrupting upward notches. Synonym: pulsus catadicrotus. (05 Mar 2000) |
| 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) |