biological clock

English

biological clock (plural biological clocks)

(biology) Any of several mechanisms that regulate the periodicity of biological functions, such as the circadian rhythm.
- 2005 US Department of Health - Your guide to healthy sleep
  Your biological clock is actually a tiny bundle of cells in your brain that responds to light signals received through your eyes.
(figuratively) A notional clock to which people should pay attention, lest menopause or andropause kicks in and it is too late for them to have children.
Her biological clock is ticking.
- 1994, Rugh Winter, Bonnie Eaker-Weil, Adultery, the Forgivable Sin:
  Take Linda, a thirty-nine-year-old newscaster who relished her career but began to hear the alarm ringing on her biological clock.

any of several mechanisms that regulate the periodicity of biological functions

Translations