biorhythm
bio·rhythm
noun \ˈbī-ō-ˌri-thəm\Definition of BIORHYTHM
: an innately determined rhythmic biological process or function (as sleep behavior); also : the internal mechanism that determines such a process or function
— bio·rhyth·mic \-ˈrith-mik\ adjective
See First Known Use of BIORHYTHM
1960
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