circadian
adjective/sɜːˈkeɪdiən/
/sɜːrˈkeɪdiən/
[only before noun] (specialist)- connected with the changes in the bodies of people or animals over each period of 24 hours
- Melatonin regulates circadian rhythms and tells the body when to go to bed or wake up.
Oxford Collocations DictionaryCircadian is used with these nouns:- clock
- rhythm
Word Origin1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.Definitions on the go
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circadian