I. noun — (usu. battlements) 1. a parapet at the top of a wall, especially of a fort or castle, that has regularly spaced squared openings for shooting through. 2. a section of roof enclosed by battlements. • I want to go up on the battlements.
II. derivatives battlemented /ˈbatlməntɪd / adjective
– origin late Middle English: from Old French bataillier ‘fortify with movable defence turrets’, possibly related to battle.