Definition
| • | 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. |
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