Sentinel
Sentinel , noun
[French sentinelle (compare Italian sentinella); probably originally, a litle path, the sentinel's beat,, and a dim. of a word meaning, path; compare French sente path. Latin semita; and Old French sentine, sentele, senteret, diminutive words. Compare Sentry.]
1.
(Military) One who watches or guards; specifically (Military), 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.
The sentinels who paced the ramparts.
2.
Watch; guard. [Obsolete]
That princes do keep due sentinel.
3.
(Zoology) A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.
Sentinel , transitive verb
1.
To watch over like a sentinel. [Rare]
To sentinel enchanted land.
2.
To furnish with a sentinel; to place under the guard of a sentinel or sentinels.