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Dictionary

sen•ti•nel

Pronunciation: (sen'tn-l), [key]
—n., v., -neled, -nel•ing or (esp. Brit.) -nelled, -nel•ling.

—n.
1. a person or thing that watches or stands as if watching.
2. a soldier stationed as a guard to challenge all comers and prevent a surprise attack: to stand sentinel.
3. Also called tag. Computers.a symbol, mark, or other labeling device indicating the beginning or end of a unit of information.

—v.t.
to watch over or guard as a sentinel.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

sentimentalize

sentry

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