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circadian rhythm

 - 3 dictionary results
circadian rhythm  
n.  A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

circadian rhythm [(suhr-kay-dee-uhn)]

An activity cycle lasting twenty-four hours. Many living things, including humans, follow a circadian rhythm. (See biological clock.)

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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Medical Dictionary

circadian rhythm n.
A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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