It is an opening in the battlements of a castle, with sides angled, the opening is larger on the inside than on the outside, through which missiles may be fired at the attackers
The archaic word for "window" is "embrasure." Technically, the word "embrasure" could be used for a window or the opening for a door.
Embrasure
Embrasure
embrasure
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The term embrasure, in military architecture, refers to the opening in a crenellation or battlement between the two raised solid portions or Merlons, sometimes called a crenel or crenelle.
One good way to improve your tone on the trumpet is to ensure that your embrasure is good.
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An embrasure is a hole in a defensive wall, through which defenders may fire at attackers. Crenelations are often seen on castle walls. They are the alternating square low spots through which an archer could fire, then duck back beside behind the wall. If you look at the US Army Engineers insignia, there are crenelations on top of the towers of the castle.
The area between the lips and teeth is the oral vestibule.vestibule
a gun slit is where you put your bullets in the gun. ANSWER A gun slit is an embrasure in the wall of a fortification (bunker, blockhouse, breastwork etc) through which a gun, a cannon can fire. There are direct or oblique embrasures.
Several items from the medieval world started with the letter "E." For instance, ell was a measure of cloth. Embrasure was an opening in the wall of a building such as a castle. Yet another "e" word was estoc, which was a sharp and thrusting sword.