Variant of COIN v.2, QUOIN.
Hence Coigned pa. pple., furnished with coigns or corner-stones, QUOINED. Coigning, furnishing with coigns; coigns collectively; QUOINING.
1801. W. Coxe, Tour Monmonth., I. 49. Built of rubble, but coigned with hewn stones.
1889. Athenæum, 3 Aug., 169/3. The Saxon coigning of long and short work, the towered arch with plain chamfered abaci.