Physiology. an innate periodicity in an organism's physiological processes, as sleep and wake cycles.

1960–65; bio- + rhythm

biorhythmic, adjective
biorhythmicity [bahy-oh-rith-mis-i-tee] , noun
biorhythmist, biorhythmicist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biorhythm (ˈbaɪəʊˌrɪðəm)
a cyclically recurring pattern of physiological states in an organism or organ, such as alpha rhythm or circadian rhythm; believed by some to affect physical and mental states and behaviour

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1960, from bio- + rhythm.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biorhythm bi·o·rhythm (bī'ō-rĭð'əm)
A biologically inherent cyclic variation or recurrence of an event or state, such as sleep cycles, circadian rhythms, and periodic diseases.

bi'o·rhyth'mic (-rĭð'mĭk) adj.
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
biorhythm   (bī'ō-rĭ'əm)  Pronunciation Key 
A recurring biological process, such as sleep, that is controlled by the circadian rhythms of an organism. See more at circadian rhythm.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
According to the biorhythm theory, the positive period of these cycles would be the best times for record athletic performance.
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