body clock

biological clock

noun Physiology.
an innate mechanism of the body that regulates its rhythmic and periodic cycles, as that of sleeping and waking.
Also called body clock.


Origin:
1950–55

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Collins
World English Dictionary
biological clock
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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

body clock n.
An internal mechanism of the body that is thought to regulate physical and mental functions in rhythm with normal daily 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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American Heritage
Science Dictionary
biological clock   (bī'ə-lŏj'ĭ-kəl)  Pronunciation Key 
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.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

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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