sentinels is a form of:

Sentinel



noun
1.
(a sentry, person who guards and keeps watch; sentry) អ្នកយាម, ឆ្មាំ
2.
(បច្ចេកទេស) អ្នកយាម
ENGLISH MEANING
noun
1.
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.
2.
A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.
verb
1.
(TRANSITIVE) To watch over like a sentinel.
2.
(TRANSITIVE) To furnish with a sentinel; to place under the guard of a sentinel or sentinels.
1.
Watch, guard