amplitude, apse, arcade, arcature, arch, arched roof, archway, bellying, bulging, ceilinged roof, concameration, concha, convexedness, convexity, convexness, cove, cupola, dome, excurvation, excurvature, flight path, geodesic dome, gibbosity, gibbousness, igloo, keystone, ogive, skewback, skin effect, skin friction, slip, span, stagger, tuberosity, tuberousness, vault, vaulting, voussoir