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

 

sentinel

 noun
noun
BrE BrE//ˈsentɪnl//
 
; NAmE NAmE//ˈsentɪnl//
 
(literary) The army
 
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a soldier whose job is to guard something synonym sentry (figurative) a tall round tower standing sentinel over the river Large dark pines stood like sentinels guarding the wintry garden. With its impressive stone tower standing sentinel over the valley, it looks much as it did in the 13th century. See related entries: The army Word Origin late 16th cent.: from French sentinelle, from Italian sentinella, of unknown origin.
See the Oxford Advanced American Dictionary entry: sentinel