American English

Definition of sentinel noun from the Oxford Advanced American Dictionary

     

    sentinel

     noun
    noun
    NAmE//ˈsɛntənl//
     
    (literary)
     
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  1. 1a soldier whose job is to guard something synonym sentry
  2. 2(figurative) a tall, round tower standing sentinel over the river Large dark pines stood like sentinels guarding the wintry garden.
See the Oxford Advanced Learner's Dictionary entry: sentinel