Answer: crenel

AnswerCrossword Clue
CRENELBattlement opening
CRENELBattlement feature
CRENELOpen space of a battlement.
CRENELEmbrasure in a parapet.
CRENELPart of a battlement
crenelany of the open spaces between the merlons of a battlement
crenelcrenature
crenelto make indentations in a parapet
crenelto crenelate