sentinelnoun [ C ]uk /ˈsen.tɪ.nəl/ us /ˈsen.t̬ɪ.nəl/
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(Definition of “sentinel” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a period of time during which an animal or person that might have a disease is kept away from other people or animals so that the disease cannot spread