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Definition of biological clock noun from the Oxford Advanced American Dictionary

     

    biological clock

     noun
    noun
     
    (technology)
     
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  1. 1a natural system in living things that controls regular physical activities such as sleeping
  2. 2(figurative) At 38, Kate's biological clock was ticking (= she was beginning to think that she would soon be too old to have children). The movements of the leaves are triggered by the plant's biological clock.
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