keel arch(n = noun.artifact) ogee arch - a pointed arch having an S-shape on both sides;
is a kind of pointed arch

abutment arch, alveolar arch, aortic arch, arch, arch brick, arch over, arch stone, arch support, basket-handle arch, bell arch, bilge keel, branchial arch, broken arch, camber arch, corbel arch, diminished arch, drop arch, drop keel, fallen arch, fin keel, flat arch, four-centered arch, gill arch, gothic arch, haemal arch, hemal arch, horseshoe arch, in an arch manner, keel, keel over, lancet arch, maya arch, mayan arch, metatarsal arch, moorish arch, neural arch, ogee arch, pectoral arch, pelvic arch, pier arch, pointed arch, proscenium arch, rampant arch, roman arch, round arch, rowlock arch, safety arch, scheme arch, scoinson arch, sconcheon arch, segmental arch, semicircular arch, shouldered arch, skeen arch, skene arch, skew arch, sliding keel, steel arch bridge, straight arch, sunken arch, superciliary arch, three-centered arch, trefoil arch, trimmer arch, triumphal arch, trumpet arch, tudor arch, vertebral arch, zygomatic arch