noun. A guard, especially a soldier posted at a given spot to prevent the passage of unauthorized persons.

noun. The duty of a sentry; watch.

noun. Same as centry, center.

noun. A place of watch; a watch-tower.

noun. Watch; guard: same as sentinel, 1.

noun. One stationed as a guard: same as sentinel, 2.

Acting as a sentry; watching.

noun. A soldier placed on guard; a sentinel.

noun. Guard; watch, as by a sentinel.

noun. a small house or box to cover a sentinel at his post, and shelter him from the weather.

noun. A guard, particularly on duty at the entrance to a military base.

noun. Sentry duty; time spent being a sentry.

noun. a person employed to keep watch for some anticipated event

"It was pitch dark, so I called the sentry and told him some one was hurt."

flying sentry  sentinel  sentry go  

security guard  watcher  watchman  

complementary  elementary  entry  gentry  supplementary  

constable  corporal  driver  ensign  goblin  

Argus  Cassandra  Charley  Jeremiah  admonisher