| heterotropia | Heterotropy Synonym: strabismus. Origin: hetero-+ G. Trope, a turning (05 Mar 2000) |
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| circadian | Relating to biologic variations or rhythms with a cycle of about 24 hours. Compare: infradian, ultradian. Origin: L. Circa, about, + dies, day (05 Mar 2000) |
| circadian clock | <physiology> A biological timing mechanism that controls cell synchronisation (a entire population of cells divides simultaneously). (09 Oct 1997) |
| circadian rhythm | The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, feeding, etc. This rhythm seems to be set by a 'biological clock' which seems to be set by recurring daylight and darkness. (12 Dec 1998) |