key-brick

Updated: August 9, 2026

The two sides of the arch having been in this way carried up to a point where the lower extremities of the two innermost bricks nearly touched, while a considerable space remained between their upper extremities instead of a key-stone, or a key-brick fitting the aperture, ordinary bricks were placed in it longitudinally, and so the space was filled in.

George Rawlinson - The Seven Great Monarchies Of The Ancient Eastern World, Vol 2: Assyria : The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations.