An indentation or embrasure in the battlement of a wall; = crenel, n. 1. Also plural (rarely singular) = battlements.

A battlement, embrasure; = carnel, n.1, kernel, n.2

An early variant of the word kernel, n.2, crenel, n., battlement, embrasure.

= cornel, n.1 a battlement, embrasure.

= crenel, n. 1. Obsolete.

An opening in the parapet of a fortification; an embrasure. Obsolete.

One of the open spaces or indentations alternating with the merlons or cops of an embattled parapet, used for shooting or launching projectiles…

An embrasure; a port-hole for a gun.

= spike-hole, n.

A loophole (loophole, n.1 1a) in a fortified chamber used to house cannon; (perhaps also) such a chamber.

A loophole or small opening in a wall.

An opening through which missiles may be discharged; an embrasure. Somewhat rare.

In extended use. An aperture in a wall, esp. serving as an embrasure; a small circular window in a building, resembling a ship's porthole (cf. porth…

An opening or loophole in a wall for a cannon or other piece of artillery.

Military. An opening widening from within made in an epaulement or parapet for the purpose of allowing a gun to be fired through it.

A small crenel or embrasure.

An opening in the body of an aircraft or in a wall or armoured vehicle through which a gun may be fired. Cf. gun-port n. at gun, n. compounds 2.