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Biological clock

noun

Definitions

Noun
  1. 1
    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."

  2. 2
    an innate mechanism in living organisms that controls the periodicity of many physiological functions wordnet
  3. 3
    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. figuratively

    "Her biological clock is ticking."

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