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Definition of Circadian rhythm
1. Noun. A daily cycle of activity observed in many living organisms.
Generic synonyms: Biological Time
Definition of Circadian rhythm
1. Noun. The "internal body clock" that regulates the (roughly) 24-hour cycle of biological processes in animals and plants. ¹
¹ Source: wiktionary.com
Medical Definition of Circadian rhythm
1. 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)