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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.
Then they gave Sentry some brains, in the form of software to analyze the chemicals it was sniffing--in this case, naturally occurring oil, gas, and other hydrocarbons leaking from the seafloor in areas known as cold seeps.