Having a series of open notches or indentations along the top, like on a castle wall or battlements.
Past participle of 'crenelate,' describing something that has been furnished with crenels. This adjective form dates to medieval architecture and has been used since at least the 15th century.
That fancy 'castle-look' crown molding in expensive Victorian houses? Many were actually copying real castle designs—crenelated edges became a status symbol showing you were important enough to have defenses (even if you really didn't need them)!
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