Answer:

crenel

Answer	Crossword Clue
CRENEL	Battlement opening
CRENEL	Battlement feature
CRENEL	Open space of a battlement.

CRENEL	Embrasure in a parapet.
CRENEL	Part of a battlement

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.