Definition of sentry noun from the Oxford Advanced Learner's Dictionary

 

sentry

 noun
noun
BrE BrE//ˈsentri//
 
; NAmE NAmE//ˈsentri//
 
(pl. sentries) The army
 
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a soldier whose job is to guard something to be on sentry duty People approaching the gate were challenged by the sentry. Everyone took their turn at sentry duty. See related entries: The army Word Origin early 17th cent.: perhaps from obsolete centrinel, variant of sentinel.
See the Oxford Advanced American Dictionary entry: sentry

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