noun, plural un·der·bod·ies.
Examples from the Web for underbody
There was a jagged hole in the underbody of the balloon, from which gas was rushing.The Boy Inventors' Radio Telephone|Richard Bonner
"The whole of the underbody of the outer envelope is watertight," he remarked.The Dreadnought of the Air|Percy F. Westerman
The green sea-growth on her underbody fans and waves in the tide, showing long voyaging in the crust and stage of it.Merchantmen-at-Arms|David W. Bone
If it is a circular hole in a dress or underbody, as often happens, under the arms, we will use the square patch.The Library of Work and Play: Needlecraft|Effie Archer Archer
Up fly the liner's hissing slings; her underbody crashes home and she hurtles away again.With The Night Mail|Rudyard Kipling