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Synonyms
sen·ti·nel (sĕńtə-nəl)

[French sentinelle, from Italian sentinella, probably from Old Italian sentina, vigilance, from sentire, to watch, from Latin sentīre, to feel.]

noun 

One that keeps guard; a sentry.

transitive verb: -neled or -nelled, -nel·ing or -nel·ling, -nels or -nels 

  1. To watch over as a guard.
  2. To provide with a guard.
  3. To post as a guard.