Longman Dictionary of Contemporary English homepage

biological clock

 noun
     
Related topics: Biology, Human
biological clock [singular]
1TMHB technical the system in plants and animals that controls when they sleep, eat, produce babies etc [= body clock]
2HBH the idea that when a woman reaches a certain age, she will soon be too old to have a baby:
career women who hear the biological clock ticking
Definition from the Longman Dictionary of Contemporary English
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