biological clock


Definition of biological clock

: an inherent timing mechanism in a living system that is inferred to exist in order to explain the timing or periodicity of various behaviors and physiological states and processes

Examples of biological clock in a Sentence

Recent Examples on the Web Falling asleep also depends on your circadian rhythm, better known as your biological clock, which coordinates mental and physical processes like the sleep-wake cycle. Jennifer Ford, Forbes, 5 May 2021 Nikole Beckwith, the writer/director of this movie, talks a lot about how men have a biological clock too, but nobody really talks about it. Angela Dawson, Forbes, 9 May 2021 Teenagers often have a three-hour difference between their school-week and weekend time zones, and the latter aligns better with their internal biological clock, Hasler said. Megan Marples, CNN, 15 Apr. 2021 That's a problem because the circadian rhythm, or the body's biological clock, controls all the hormones of the body, body temperature, eating and digestion, and sleep-wake cycles. Sandee Lamotte, CNN, 14 Mar. 2021 That doesn’t sit well with some fans and critics, who see the Warriors as wasting a year of Curry’s prime, as his biological clock ticks away. Scott Ostler, San Francisco Chronicle, 7 Mar. 2021 The gradual shortening of days until the winter solstice messes up our circadian rhythm, the biological clock that takes note of daylight hours and regulates sleep, appetite, body temperature, heart rate and hormone production. Popular Science, 24 Jan. 2021 Although the specific causes aren't quite known, SAD is often linked to your biological clock, which dictates processes like your sleep-wake cycle. Jessica Bennett, Better Homes & Gardens, 17 Nov. 2020 Unfortunately, these habits constantly mess up your inner biological clock, called the circadian system. Jade Wu Savvy Psychologist, Scientific American, 27 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'biological clock.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of biological clock

1941, in the meaning defined above

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Time Traveler for biological clock

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The first known use of biological clock was in 1941

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Statistics for biological clock

Last Updated

30 May 2021

Cite this Entry

“Biological clock.” Dictionary, Merriam-Webster, Accessed 19 Jun. 2021.

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More Definitions for biological clock

biological clock


English Language Learners Definition of biological clock

: a system in the body that controls the occurrence of natural processes (such as waking, sleeping, and aging)

biological clock


Medical Definition of biological clock

: an inherent timing mechanism in a living system (as a cell) that is inferred to exist in order to explain various cyclical behaviors and physiological processes

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