Sentry \Sen"try\, 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.

2. 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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Kite \Kite\, n. (Naut.) A form of drag to be towed under water at any depth up to about forty fathoms, which on striking bottom is upset and rises to the surface; -- called also sentry.

Source: Webster's Revised Unabridged Dictionary (1913)