circadian

circadian

CEFR: C1-C2 /cir-ca-di-an/ [s.er0.k.ey1.d.iy0.ah0.n]

Definition: (Of biological processes) recurring naturally on a twenty-four-hour cycle, even in the absence of light fluctuations

Example Sentences:
Although caffeine's effects on alertness and sleep are well known, researchers weren't sure how it affects the circadian clock in humans.