Noun: sentinel sen-t(u-)nul [N. Amer], sen-ti-nul [Brit]
- A person employed to keep watch for some anticipated event
"the sentinel stayed in his box to avoid the cold";
- lookout, sentry, watch, spotter, scout
Derived forms: sentineled, sentineling, sentinelled, sentinelling, sentinels
Type of: security guard, watcher
Encyclopedia: Sentinel, OK