A World War II bomber with bomb bay doors open.
bomb bay definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a storage compartment in the fuselage of a bomber, with doors beneath it, for carrying bombs, fuel tanks, spare parts, etc.
bomb bay definition by American Heritage Dictionary
The compartment in the fuselage of a combat aircraft into which bombs are loaded and from which they are dropped.