Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for sentinel from the 1913 edition of Webster's Revised Unabridged Dictionary. Define sentinel using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 5
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. Watch; guard.
3. A marine crab ( Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; - called also sentinel crab.
Part of Speech: verb transitive
1. To watch over like a sentinel.
2. To furnish with a sentinel; to place under the guard of a sentinel or sentinels.
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