pectoral arch(n = noun.body) shoulder girdle - the bony arch formed by the collarbones and shoulder blades in humans;
is a kind of arch
is a part of pectoral girdle

abutment arch, alveolar arch, aortic arch, arch, arch brick, arch over, arch stone, arch support, basket-handle arch, bell arch, branchial arch, broken arch, camber arch, corbel arch, diminished arch, drop arch, fallen arch, flat arch, four-centered arch, gill arch, gothic arch, greater pectoral muscle, haemal arch, hemal arch, horseshoe arch, in an arch manner, keel arch, lancet arch, maya arch, mayan arch, metatarsal arch, moorish arch, neural arch, ogee arch, pectoral, pectoral fin, pectoral girdle, pectoral medallion, pectoral muscle, pectoral sandpiper, pectoral vein, 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, smaller pectoral muscle, 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