Dictionary

biological clock

noun

: a system in the body that controls the occurrence of natural processes (such as waking, sleeping, and aging)

Full Definition of BIOLOGICAL CLOCK

:  an inherent timing mechanism in a living system that is inferred to exist in order to explain the timing or periodicity of various behaviors and physiological states and processes

First Known Use of BIOLOGICAL CLOCK

1955

biological clock

noun    (Medical Dictionary)

Medical Definition of BIOLOGICAL CLOCK

:  an inherent timing mechanism in a living system (as a cell) that is inferred to exist in order to explain various cyclical behaviors and physiological processes

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