- of or relating to a biorhythm or regular biological cycle occurring once every 24 hours, such as waking and sleeping: Exposure to blue light at night can disrupt your circadian rhythm, making your biological clock think it's earlier in the day rather than time for bed.He is doing research related to the circadian cycling of hormones.
- of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment
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