Definition of biological clock in English:

biological clock

Syllabification: bi·o·log·i·cal clock

noun

  • An innate mechanism that controls the physiological activities of an organism that change on a daily, seasonal, yearly, or other regular cycle.
    More example sentences
    • Yes, that's controlled by an internal biological clock.
    • At dusk, however, the insect is activated by an internal biological clock, which regulates most of its behaviors.
    • This helps set the internal biological clock that regulates your sleep and waking patterns.

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Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
noun
grotesque quality or grotesque things collectively