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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.
Definition of masonry. plural. masonries. 1a : something constructed of materials used by masonsb : the art, trade, or occupation of a masonc : work done by a mason. 2 capitalized : freemasonry.