[bahy-oh-rith-uh m]
See more synonyms for biorhythm on

Origin of biorhythm

First recorded in 1960–65; bio- + rhythm
Related formsbi·o·rhyth·mic, adjectivebi·o·rhyth·mic·i·ty [bahy-oh-rith-mis-i-tee] /ˌbaɪ oʊ rɪðˈmɪs ɪ ti/, nounbi·o·rhyth·mist, bi·o·rhyth·mi·cist, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for biorhythm


British Dictionary definitions for biorhythm


  1. 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
Derived Formsbiorhythmic, adjectivebiorhythmically, adverb
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

Word Origin and History for biorhythm

also bio-rhythm, 1960, from bio- + rhythm. Related: Biorhythmic.

Online Etymology Dictionary, © 2010 Douglas Harper

biorhythm in Medicine


  1. A biologically inherent cyclic variation or recurrence of an event or state, such as sleep cycles and circadian rhythms.
Related formsbi′o•rhythmic (-rĭðmĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

biorhythm in Science


  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.