sentinel

1. n. 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. Source: opted

2. n. Watch; guard. Source: opted

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

4. v. t. To watch over like a sentinel. Source: opted

5. v. t. To furnish with a sentinel; to place under the guard of a sentinel or sentinels. Source: opted

6. n. a person employed to keep watch for some anticipated event Source: wordnet

7. A marine crab (Podophthalmus vigil) native of the Indian Ocean,remarkable for the great length of its eyestalks; -- called alsosentinel crab. Source: adambom

8. n:100 n a person employed to keep watch for some anticipated event Source: ecdict

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