coign /kɔɪn/noun 5verb 1forms 3 noun5 •A projecting corner or angle; a cornerstone.By many a dern and painful perch Of Pericles the careful search By the four opposing coigns Which the world together joins, Is made with all due diligence — 1607 •A a corner of a crystal formed by the intersection of three or more faces at a point (in crystallography)In both the orthogonal and clinographic projections the light rays joining the eye and crystal coigns (solid angles, corners at which three or more edges meet) are all parallel — 1922 •The keystone of an arch. •A wedge used in typesetting. •An original angular elevation of land around which continental growth has taken place (in geology)South of the North American coign we have again a pair of east - west mountain chains — 1901 verb1 •To furnish with coigns.The angles were always coigned, and the arches turned with squared stone, brought from Caen in Normandy […] — 1773 formscoigned · coigning · coigns
