Translation guide
A crenel is the open space between merlons on a battlement, used historically for defense. This is a specialized architectural term with limited direct equivalents in Japanese, mostly found in historical or technical contexts.
The open space in a castle wall battlement used for shooting or observation.
General term for an embrasure, loophole, or crenel in fortifications. Can refer to openings for arrows or guns.
城壁の狭間から敵を狙う。
Aim at the enemy through the crenel in the castle wall.
Specifically a gun loop or firing port, often used for crenels designed for firearms.
Arrow loop, a vertical slit for archers. More specific than general crenel.
矢狭間から矢を放つ。
Shoot an arrow through the arrow loop.
Descriptive phrase meaning 'recessed part of a parapet'. Used in technical descriptions but not a standard term.
胸壁の凹部は防御のための設計です。
The crenels are designed for defense.
In everyday English, 'crenel' is rare. In Japanese, architectural terms like 狭間 are also specialized. For casual conversation, you might describe it as 城壁の隙間 (gap in the castle wall).
The crenels in this castle are small and hard to aim through.