
hypothesis holding that human physiology and behavior are governed by physical, emotional, and intellectual cycles lasting , , and days, respectively. The system posits that, for instance, errors in judgment are more probable on days when an individual's intellectual cycle, as determined by days since birth, is near a minimum. No biophysical mecha...
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http://en.wikipedia.org/wiki/Glossary_of_pseudoscience

Roughly periodic changes in the behavior or physiology of an organism that is maintained and generated by a biological clock. Well known examples are the sleep cycle, annual rhythms, or menstrual cycles.
Found on
http://www.daviddarling.info/encyclopedia/B/biorhythms.html

biorhythm, biorhythms, biorhythmic; biological rhythm 1. Supposed regular cycles in human physiological processes that affect emotions and behavior. 2. A biologically inherent cyclic variation or recurrence of an event or state; such as, the sleep cycle, circadian rhythms, or periodic diseases. 3. An endogenous cyclic variation in some aspect of a...
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http://www.wordinfo.info/words/index/info/view_unit/1857/2
No exact match found.