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circadian

[ sur-key-dee-uhn ]

Phonetic (Standard)IPA

adjective

Physiology.

of or relating to a biorhythm or regular biological cycle occurring once every 24 hours, such as waking and sleeping: Compare infradian ( def ), ultradian ( def ).
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.

circadian

/ ��ɜːˈ��ɪ��ɪə�� /

adjective

of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment See also biological clock

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Word History and Origins

Origin of circadian¹

First recorded in 1955–60; from �� “about” + Latin �徱(ŧ��) “day” + -an ( def ); circa ( def )

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Word History and Origins

Origin of circadian¹

C20: from Latin circa about + �徱ŧ�� day

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Example Sentences

Examples have not been reviewed.

Sleep is controlled through an internal process known as the circadian system that repeats roughly every 24 hours.

From

“When the bioenergetics are damaged, you can imagine that it has detrimental effects … impacting your immune system and circadian rhythm.”

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Alcohol also affects circadian rhythms — the 24-hour body clock that responds to environmental light cues in order to synchronize our sleep-wake cycle.

From

I built my day around my nights, transfixed by a false sense of control over my circadian rhythm.

From

This finding answers a long-standing question in cell biology -- how do cells integrate signals from two oscillatory processes -- the cell cycle and the circadian rhythm -- which operate a different frequencies?

From

Related Words

circa circadian rhythm

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