Definition of circadian in English:

circadian

adjective

Physiology
  • (of biological processes) recurring naturally on a twenty-four-hour cycle, even in the absence of light fluctuations.

    ‘a circadian rhythm’
    • ‘In continuous light, circadian growth rhythms were detectable for up to 2 weeks.’
    • ‘While discussing the mechanisms underlying circadian rhythms, it would be well worth mentioning their genetic basis.’
    • ‘Jet lag happens when the body's circadian rhythms are disrupted by changes in light.’
    • ‘Otherwise known as our circadian rhythm, our 24-hour body clock resets itself at sunrise and sunset each day.’
    • ‘Terry learned to eat in tune with his natural circadian rhythms.’
    daily, everyday, occurring each day, occurring every day, day-to-day
    View synonyms

Origin

1950s: formed irregularly from Latin circa about + dies day.

Pronunciation:

circadian

/səːˈkeɪdɪən/