<p><strong>Noun</strong></p><ul><li>any of the open spaces between the merlons of a battlement</li><li>a crenature</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) creneled, crenel-ing or (especially British) crenelled, crenel-ling</li><li>to crenelate</li></ul>