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A crenel (also spelled as " crenelle" and alternatively known as a "carnel", " embrasure", " loop" or "wheeler'") is an indentation in the 15th century from Old French and comes ultimately from the Latin word crena, "notch". Its opposite is the merlon.
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Crenellation- same as battlements. Traditionally seen as being defensive, recent research suggests that "a licence to crenelate" may have been granted more for heraldic reasons, as a mark of grace and favour.
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Crenel, Crenelle: The part of a parapet which is indented alternating with the solid uprights called merlons, which allowed the defenders to fire at the enemy while gaining protection from the merlons against the returned fire.
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crenellation: fortification- a "license to crenellate" was official per mission to raise a fortified building or fortify an existing structure. Jagged protective stonework at the top of a castle wall. crenels: low sections of the battlements.
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See also: Tower, Square, Brick, Wall, Roof

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