Synonyms for circadian
sɜrˈkeɪ di ən, ˌsɜr kəˈdi əncir·ca·di·an

Princeton's WordNet

1. circadianadjective

   of or relating to biological processes occurring at 24-hour intervals

   "circadian rhythms"

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How to use circadian in a sentence?

1. Raj Dasgupta:

   The dietary supplement melatonin is not a potent sleeping aid, it’s good for shifting your circadian rhythm. Usually, we suggest people take it two hours before their desired sleep time.

2. Vsevolod Polotsky:

   Digital light will suppress the circadian drive.

3. Chuangshi Wang:

   Napping could reflect underlying ill-health( fatigue, tiredness) eventually leading to morbidity and mortality, could be a proxy for sleep deprivation, as a compensatory catch-up mechanism, or could also be a symptom of circadian misalignment.

4. Michael Terman:

   The circadian timing system modulates the activity of every cell in our body. Timed light exposure is nature’s way of keeping the activity of these cells in check.

5. Nick Littlehales:

   The phone I'm talking to you on now was simply a mobile phone when I was walking around Manchester United football club in 1998 -- it is now used for so many different things, they have a counter-productive effect on a very natural process called our circadian rhythms, which has so many biological consequences in our bodies.