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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.
The Sentry (Robert Bob Reynolds) is a fictional superhero appearing in American comic books published by Marvel Comics. The character first appears in The Sentry #1 (Sep. 2000) and was created by Paul Jenkins and Jae Lee, with uncredited conceptual contributions by Rick Veitch.