The part of anything which resembles (either closely or abstractly) the human belly in protuberance or in concavity; often, the fundus (innermost part).
The stomach.
The main curved portion of a knife blade.
The abdomen, especially a fat one.
The womb.
The hollow part of a curved or bent timber, the convex part of which is the back.
The lower fuselage of an airplane.
To swell and become protuberant; to bulge or billow.
To cause to swell out; to fill.
To position one’s belly; to move on one’s belly.
Each of the two large fleshy halves of the posterior part of the body between the base of the back, the perineum and the top of the legs.
The convexity of a ship behind, under the stern.