CIRCADIAN


Meaning of CIRCADIAN in English

/ sɜːˈkeɪdiən; NAmE sɜːrˈk-/ adjective

[ only before noun ] ( technical ) connected with the changes in the bodies of people or animals over each period of 24 hours

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WORD ORIGIN

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

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.