Arch. [OF. escoinçon (mod. écoinson).] A stone that forms the upper part of an arched window. In quot. attrib.
1867. H. T. Ellacombe, in Trans. Exeter Archit. Soc., I. Ser. II. 98. The jambs of these windows are splayed on the inside, and surmounted by escoinçon arches.
