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Entry 5 senses · 2 variants Webster, 1913

Sentinel

· Sen·ti·nel · IPA /ˈsɛn.tɪ.nəl/
01 n. One who watches or guards; specifically (Mil.), a soldier set to guard an army, camp, or other place, from surprise, to observe the approac…
  1. 1.
    One who watches or guards; specifically (Mil.), a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry.(Mil.)
    “The sentinels who paced the ramparts.” — Macaulay.
  2. 2.
    Watch; guard.[Obs.]
  3. 3.
    A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.(Zool.) Also: sentinel crab
02 v. t. To watch over like a sentinel.
imp. & p. p. Sentineled; p. pr. & vb. n. Sentineling
  1. 1.
    To watch over like a sentinel.[R.]
  2. 2.
    To furnish with a sentinel; to place under the guard of a sentinel or sentinels.