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  1. Dictionary
    circadian
    /səːˈkeɪdɪən/

    adjective

    • 1. (of biological processes) recurring naturally on a twenty-four-hour cycle, even in the absence of light fluctuations: "a circadian rhythm"

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  3. www.merriam-webster.com › dictionary › circadianCircadian Definition & Meaning - Merriam-Webster

    Circadian means being, having, or occurring in about 24-hour periods or cycles, such as biological rhythms. Learn the origin, examples, and medical usage of this word from Merriam-Webster dictionary.

  4. dictionary.cambridge.org › english › circadianCIRCADIAN | English meaning - Cambridge Dictionary

    Circadian means "about a day" and refers to the natural processes in animals and plants that occur in a 24-hour cycle. Learn more about the circadian system, clock, and rhythm, and see how they are used in sentences and translations.

  5. my.clevelandclinic.org › health › articlesCircadian Rhythm: What It Is, How It Works & What Affects It

    Mar 15, 2024 · Circadian rhythm is your body’s natural 24-hour clock that regulates your sleep, hormones, digestion and other processes. Learn how it works, what affects it and how to keep it healthy.

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  7. en.wikipedia.org › wiki › Circadian_rhythmCircadian rhythm - Wikipedia

    A circadian rhythm is a natural oscillation that repeats roughly every 24 hours and is regulated by a circadian clock. Learn about the origin, discovery and evolution of circadian rhythms in different organisms and their clinical implications.

  8. www.britannica.com › science › circadian-rhythmCircadian rhythm | Definition, Examples, & Facts | Britannica

    Sep 16, 2024 · Circadian rhythm is the 24-hour cycle of biological activity that regulates sleep, hormones, and other functions. Learn how the brain, light, and melatonin control the circadian cycle and how it affects health and behavior.

    • The Editors of Encyclopaedia Britannica

  9. nigms.nih.gov › Pages › Circadian-RhythmsCircadian Rhythms - National Institute of General Medical ...

    Dec 11, 2023 · Circadian rhythms are the physical, mental, and behavioral changes an organism experiences over a 24-hour cycle. Learn how they are controlled by biological clocks, how they affect human health, and how researchers study them.

  10. www.dictionary.com › browse › circadianCIRCADIAN Definition & Meaning - Dictionary.com

    Circadian means of or relating to a biological cycle that lasts about 24 hours, such as the sleep-wake cycle. Learn the origin, usage and examples of circadian from Dictionary.com.