crescent-shaped bow-shaped PATO:0001870 A shape quality inhering in a circular disk by virtue of the bearer's having a segment of another circle removed from its edge, so that what remains is a shape enclosed by two circular arcs of different diameters which intersect at two points (usually in such a manner that the enclosed shape does not include the center of the original circle). Image:http://upload.wikimedia.org/wikipedia/commons/7/74/Crescent.svg lunate crescentic quality 2-D shape