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Noun: sentinel  sen-t(u-)nul [N. Amer], sen-ti-nul [Brit]
  1. A person employed to keep watch for some anticipated event
    "the sentinel stayed in his box to avoid the cold";
    - lookout, lookout man, sentry, watch, spotter, scout, picket
Verb: sentinel (sentinelled,sentinelling, or [US] sentineled,sentineling)  sen-t(u-)nul [N. Amer], sen-ti-nul [Brit]
  1. Watch over or post as a guard

Derived forms: sentinelled, sentineling, sentinelling, sentinels, sentineled

Type of: security guard, watcher, watchman

Encyclopedia: Sentinel, Missouri