biological clock

noun

: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
But using your personal biological clock as a guide could be more beneficial than purely observing time on a watch face. New Atlas, 13 July 2025 Advertisement To generate a stronger scientific basis for a biological clock, Wyss-Coray began with the fact that organs in the body tend to produce specific proteins that are unique to them. Alice Park, Time, 9 July 2025 People who got plasma exchange therapy paired with immune antibodies saw the largest effect, rolling back their biological clocks by an average of 2.6 years. Jamie Ducharme, Health, 6 June 2025 There’s something deep in our biological clocks that can’t seem to help but welcome the days when the sun stays up past 8 pm and the air temperature reaches equilibrium with our bodies. Bryan Walsh, Vox, 26 May 2025 See All Example Sentences for biological clock

Word History

First Known Use

1941, in the meaning defined above

Time Traveler
The first known use of biological clock was in 1941

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Cite this Entry

“Biological clock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/biological%20clock. Accessed 21 Jul. 2025.

Kids Definition

biological clock

noun
: a mechanism that exists in living things and controls the timing of behaviors and bodily functions which occur in cycles

Medical Definition

biological clock

noun
: 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

More from Merriam-Webster on biological clock

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