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

sentinel

noun
 
/ˈsentɪnl/
 
/ˈsentɪnl/
(literary)
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  1. 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.
    Topics War and conflictc2
    Word Originlate 16th cent.: from French sentinelle, from Italian sentinella, of unknown origin.
See sentinel in the Oxford Advanced American Dictionary
perspective
noun
 
 
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