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BNC: 41211 COCA: 24116

circadian

adjective
/sɜːˈkeɪdiən/
/sɜːrˈkeɪdiən/
[only before noun] (specialist)
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  1. connected with the changes in the bodies of people or animals over each period of 24 hours(每 24 小时人或动物体内变化)昼夜节律的,生理节奏的
    • Jet lag occurs because jet travel ignores the circadian timekeeper.时差反应的发生是因为时差旅行忽略了生物钟。
    Oxford Collocations DictionaryCircadian is used with these nouns:
    • clock
    • rhythm
    See full entry
    Word Origin1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.

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