n.; pl.Sentires [ Probably from OF. senteret a little patch; cf. F. sentier path, and OF. sente. See Sentinel. ] 1. (Mil.) A soldier placed on guard; a sentinel. [ 1913 Webster ]
2. Guard; watch, as by a sentinel. [ 1913 Webster ]
Here toils, and death, and death's half-brother, sleep, Forms terrible to view, their sentry keep. Dryden. [ 1913 Webster ]
Sentry box, a small house or box to cover a sentinel at his post, and shelter him from the weather. [ 1913 Webster ]