An opening in the upper part of a fortification wall, or a battlement; also spelled crenelle.
From Old French 'crenel' (notch), derived from Latin 'crena' meaning notch, referring to the square openings in castle walls.
When medieval defenders stood on castle walls, they'd peek through crenels to see enemies approaching, then duck behind the solid parts—a deadly game of peek-a-boo with real consequences!
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