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Circadian rhythm

Circadian rhythm

 
pronunciation:
sr keI di n rI thm
part of speech: noun
definition 1: the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like.
It's difficult for most of us to sleep during the daylight hours because of our Circadian rhythm.
definition 2: (pl.; informal) See biorhythm.