| Definition of 'circadian rhythm' |
Princeton's WordNet |
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1. (noun) circadian rhythm
a daily cycle of activity observed in many living organisms
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| Definition of 'circadian rhythm' |
U.S. National Library of Medicine |
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1. 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.
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Definitions of circadian rhythm 
