What are embrasures?

Embrasures

In military architecture, an embrasure is the opening in a crenellation or battlement between the two raised solid portions or merlons, sometimes called a crenel or crenelle. In domestic architecture this refers to the outward splay of a window or arrow slit on the inside.

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Some articles on embrasures:

British Hardened Field Defences Of World War II - Other Hardened Defences - Dover Quad
... Horizontal section at the level of the embrasures ... Note square plan with wide embrasures ... Quad pillbox is a 13 feet (4.0 m) square pillbox with wide embrasures and an overhanging roof slab ...
Dental Anatomy - Anatomic Landmarks - Embrasures
... Embrasures are triangularly shaped spaces located between the proximal surfaces of adjacent teeth ... The borders of embrasures are formed by the interdental papilla of the gingiva, the adjacent teeth, and the contact point where the two teeth meet ... There are four embrasures for every contact area facial (also called labial or buccal), lingual (or palatal), occlusal or incisal, and cervical or ...
British Hardened Field Defences Of World War II - FW3 Pillbox Types - Type 25
... Horizontal section at the level of the embrasures ... Pillbox Type FW3/25, horizontal section at the level of the embrasures ... There were three embrasures suitable for rifles or light machine guns and a small entrance like a low window ...
British Hardened Field Defences Of World War II - Other Hardened Defences - Eared Pillbox
... Horizontal section at the level of the embrasures ... Note large embrasures with projecting boxes (grey) and small internal anti-ricochet wall ... There are two large embrasures intended for medium machine guns ...