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biological clock

noun, Physiology
1.
an innate mechanism of the body that regulates its rhythmic and periodic cycles, as that of sleeping and waking.
Also called body clock.
Origin
1950-1955
1950-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for biological clock
  • Anyway, that was a good scientific study utilizing the knowledge that repeated naps do not reset the biological clock.
  • But when one team has had more time to adjust its biological clock than the other, the advantage begins.
  • He speculates that great whites also possess a biological clock and a heightened spatial sense.
  • Some experts believe the short days and long nights affect the body's biological clock, or circadian rhythm.
  • For this reason, the biological clock must be reset or corrected every day of normal life.
  • The sleep-wake cycle is dictated by an inherent biological clock or circadian rhythm.
British Dictionary definitions for biological clock

biological clock

noun
1.
an inherent periodicity in the physiological processes of living organisms that is not dependent on the periodicity of external factors
2.
the hypothetical mechanism responsible for this periodicity
See also circadian
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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biological clock in Medicine

biological clock n.
An innate mechanism in living organisms that controls the periodicity or rhythm of various physiological functions or activities.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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biological clock in Science
biological clock
  (bī'ə-lŏj'ĭ-kəl)   
An internal system that controls an organism's circadian rhythms, the cycles of behavior that occur regularly in a day. In mammals, the biological clock is located near the point in the brain where the two optic nerves cross. In many birds, the biological clock is located in the pineal gland. In protists and fungi, the individual cells themselves regulate circadian rhythms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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biological clock in Culture

biological clock definition


The innate rhythm of behavior and body activity in living things. A twenty-four-hour cycle of body activity, which operates in some organisms, is called the circadian rhythm.

Note: Although the term biological clock refers to all innate timing mechanisms, it is often used when describing certain body functions that are subject to this rhythm, such as the loss of fertility with age.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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