biological clocknoun [ C ]uk /baɪ.əˌlɒdʒ.ɪ.kəl ˈklɒk/ us /baɪ.əˌlɑː.dʒɪ.kəl ˈklɑːk/
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(Definition of “biological clock” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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something that a copy can be based on because it is an extremely good example of its type