Definition of circadian in English:


Syllabification: cir·ca·di·an
Pronunciation: /sərˈkādēən


  • (Of biological processes) recurring naturally on a twenty-four-hour cycle, even in the absence of light fluctuations: a circadian rhythm
    More example sentences
    • 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.
    • Terry learned to eat in tune with his natural circadian rhythms.


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

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
elaborate ornamentation of a vocal melody