Organism Function
circadian rhythm Audio
[ sur-key-dee-uhn, -kad-ee-, sur-kuh-dee-uhn rith-uhm ]
Subclass of:
Periodicity
Definitions related to circadian rhythms:
  • Any biological process in an organism that recurs with a regularity of approximately 24 hours.
    Gene Ontology Dictionary
    Gene Ontology Consortium, 2021
  • Rhythmic recurrences of certain phenomena in living organisms occurring at about the same time of day, i.e., on a 24 hour cycle.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • The body's biological clock that regulates the sleep/wake cycle and other physiological processes.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiological stimuli.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.