A crenellated parapet or the notched defensive structure on top of a castle or fortification wall.
From 'embattle' combined with the suffix '-ment,' which creates nouns meaning 'the result of' or 'the thing itself.' It specifically names the architectural feature created by crenellating walls.
The crenellations that create 'embattlements' reveal brilliant medieval design—each rectangular opening (called a 'crenel') lets defenders shoot outward while the solid parts (called 'merlons') protect them from enemy fire.
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