That bulges; that has a bulge.
bell-shaped · bellied · bellying · biconvex · broken-backed · bulbous · bulgy · convex · convexo-concave · convexo-convex · gibbose · gibbous · helmet-shaped · hogged · lenticular · lentiform · nipple-shaped · planoconvex · protrusive · protuberant · umbel-like · umbellate