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sentry (plural sentries) 1  A guard, particularly on duty at the entrance to a military base. ( 2 uncountable) Sentry duty; time spent being a sentry. ( 3 nautical) A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
Old English weard a guarding, a watchman, a sentry, from West Germanic *wardo (cf. Old Saxon ward, Old Norse vÃ¶rÃ°r, Old High German wart). Used for administrative districts (at first in the sense of guardianship) from late 14c.; of hospital divisions from 1749.