1. sentinel - Noun
2. sentinel - Verb
3. Sentinel - Proper 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.
Watch; guard.
A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.
To watch over like a sentinel.
To furnish with a sentinel; to place under the guard of a sentinel or sentinels.
Source: Webster's dictionaryThe virtue which requires to be ever guarded is scarcely worth the sentinel. Oliver Goldsmith
The temple of the sylvan goddess, indeed, has vanished, and the King of the Wood no longer stands sentinel over the Golden Bough. James Frazer
We have been taught to regard a representative of the people as a sentinel on the watch-tower of liberty. Daniel Webster
I am not meet for petty men, the book a boss: They saw not Arthur's virtue beyond the Fort of Glasses. Three score centuries of men stationed on the wall: to speak with its sentinel was not easy. Three fulnesses of Prydwen we went with Arthur, Save for seven none came up from Fort Hindrance. Taliesin
Our bugles sang truce, for the night-cloud had lower'd, And the sentinel stars set their watch in the sky; And thousands had sunk on the ground overpower'd, The weary to sleep, and the wounded to die. Thomas Campbell
The eyes like sentinel occupy the highest place in the body. Cicero