Definitions for "Quoins"
It is a term given for the stone at the corner of a wall emphasised by size, projection, and rustication or by a different finish.
rectangles of stone or wood used to accentuate and decorate the corner of a building
Squared, heavy stones or brick blocks used at the corners of buildings as decorative elements or to reinforce masonry walls.
Keywords:  keystone, cornerstone
Cornerstone or keystone
Keywords:  quad, upper
upper quad
Keywords:  chase, wedges, exert, lateral, lock
Small wedges of various sizes used to lock up the forme. They are made of wood or metal, and exert lateral pressure on the type within the chase.