noun. One that keeps guard; a sentry.

transitive verb. To watch over as a guard.

transitive verb. To provide with a guard.

transitive verb. To post as a guard.

noun. Watch or guard kept by a soldier stationed for the purpose at a particular place.

noun. A soldier stationed as a guard, either to challenge persons drawing near and to allow to pass only those who give a watchword, and, in the absence of this, to resist them and give an alarm, or for display or ceremony only.

noun. A sentinel-crab.

Acting as a sentinel; watching.

To watch over as a sentinel.

To furnish with a sentinel or sentinels; place under the guard of sentinels.

noun. 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.

noun. Watch; guard.

noun. A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.

transitive verb. To watch over like a sentinel.

transitive verb. To furnish with a sentinel; to place under the guard of a sentinel or sentinels.

noun. A sentry or guard.

noun. a unique string of characters recognised by a computer program for processing in a special way; a keyword.

verb. To watch over as a guard.

verb. To post as guard.

verb. To post a guard for.

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

"I do have a veterinarian friend who has what he calls a sentinel cat."

sentineled  sentineling  sentinelled  sentinelling  

security guard  watcher  watchman  

constable  defender  escort  fortress  garrison  

guard  sentry  watch  

sentinel crab  

sentineled  sentineling  sentinelled  sentinelling  sentinels