biorhythm

bio·rhythm

noun \ˈbī-ō-ˌrith-əm\

Definition of BIORHYTHM

: an innately determined rhythmic biological process or function (as sleep behavior); also : an innate rhythmic determiner of such a process or function

—bio·rhyth·mic \ˌbī-ō-ˈrith-mik\ adjective

—bio·rhyth·mic·i·ty \-rith-ˈmis-ət-ē\ noun, plural bio·rhyth·mic·i·ties