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Noun: sentinel  sent(u)nul [N. Amer], sentinul [Brit]
  1. A person employed to keep watch for some anticipated event
    - lookout, lookout man, sentry, watch, spotter, scout, picket

Derived forms: sentinels

Type of: security guard, watcher, watchman

Encyclopedia: Sentinel, Melbourne High School Sentinel Sentinel, OK Sentinel, The Sentinel, Oklahoma