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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.
Help! In times of emergency, when life may be endangered, this is the first word that comes to mind. Sentry Products provides an emergency communication system designed to protect people who work or live in institutions where there is the threat of violence, industrial Hazard, or medical alert. A system such as this, so vital to human life, cannot fail. That is why we made system dependability our highest priority.