sconcheon
noun
scon·cheon
ˈskänchən
variants or scuncheon
ˈskən-
plural -s
: the part of the side of an opening from the back of the reveal to the inside face of the wall usually forming in the masonry a rabbet in which the wooden frame is set
Word History
Etymology
Middle English scouchon, skonchon, sconcheon, from Middle French escoinsson, escouchon, escochon, from coing, coin wedge, stamp, corner