Definitions for "Crenelation"
The characteristic top of a castle wall where open spaces for shooting arrows or guns alternate with higher projections (Merlons) behind which soldiers could take shelter while reloading.
Battlements at the top of a tower or wall.
a rampart built around the top of a castle with regular gaps for firing arrows or guns
Keywords:  embrasure, indentation, act
The act of crenelating, or the state of being crenelated; an indentation or an embrasure.