biorhythms

bi·o·rhythm   (bī'ō-rĭth'əm)    n.  An innate, cyclical biological process or function. bi'o·rhyth'mic (-rĭth'mĭk) adj.

Main Entry: bio·rhythm
Pronunciation: 'bI-O-"rith-&m
Function: noun
: an innately determined rhythmic biological process or function (assleep behavior); also : an innate rhythmic determiner of such a process or function —bio·rhyth·mic /"bI-O-'rith-mik/ adjective —bio·rhyth·mic·i·ty /-rith-'mis-&t-E/ noun plural -ties

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

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bi'o·rhyth'mic (-rĭ&phonth;'mĭk) adj.