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|Noun||1.||defensive structure - a structure used to defend against attack; "the artillery battered down the defenses"|
cheval-de-frise, chevaux-de-frise - defensive structure consisting of a movable obstacle composed of barbed wire or spikes attached to a wooden frame; used to obstruct cavalry
fortification, munition - defensive structure consisting of walls or mounds built around a stronghold to strengthen it
line of defence, line of defense - defensive structure consisting of a barrier that can be employed for defense against attack
outwork - subsidiary defensive structure lying outside the main fortified area; "the outworks of the castle"