A Belly

1. The abdomen, especially a fat one.
2. The stomach.
3. The womb.
4. The lower fuselage of an airplane.
5. The part of anything which resembles the human belly in protuberance or in cavity; the innermost part.
6. (architecture) The hollow part of a curved or bent timber, the convex part of which is the back.

Usage notes

• Formerly, all the splanchnic or visceral cavities were called bellies: the lower belly being the abdomen; the middle belly, the thorax; and the upper belly, the head.