Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Sentry \Sen"try\, n.; pl. Sentires. [Probably from OF. senteret a little patch; cf. F. sentier path, and OF. sente. See Sentinel.]
(Mil.) A soldier placed on guard; a sentinel.
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Guard; watch, as by a sentinel.
Here toils, and death, and death's half-brother, sleep, Forms terrible to view, their sentry keep.
--Dryden.Sentry box, a small house or box to cover a sentinel at his post, and shelter him from the weather.
WordNet
n. a small shelter with an open front to protect a sentry from the weather
Wikipedia
Sentry Box is a historic home located at Fredericksburg, Virginia. It was built in 1786, and is a large two-story, five-bay, Georgian style frame dwelling with Colonial Revival and Greek Revival-style details. It has a central-passage plan and side gable roof. Also on the property is a contributing icehouse.
It was listed on the National Register of Historic Places in 1992. It is located in the Fredericksburg Historic District.
Usage examples of "sentry box".
He lay there now and looked away from the road and the sentry box and across to the far mountain.
In the sentry box were two figures like black paper silhouettes: SS.
The steamer lurched, jamming me into the side of the sentry box as it turned onto the narrower stone road that headed directly south toward the mountains.
He ran the length of the building as fast as his sore leg would allow and paused at the next corner by the sentry box, then cautiously inched his head out.
Some of the women shed tears as he passed through the gate, and many of us climbed to sentry box and cabin roof that we might see the last of the little company wending its way across the fields.
Outside the gate, beside a stone sentry box, stand two men in quilted gray uniforms.