n. In naval architecture, that part of a vessel which is below the load water-line. Also called under-water body.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the soft belly or underside of an animal's body
Word Usage
"When I mentioned that another executive had said the underbody was a well-proven design that didn’t need much testing, he shot me a look of disbelief."