the hull, as distinguished from the rest of a ship.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for main body
Meanwhile the main-body, hearing of the danger of their companions, had ridden off hastily to their aid.The Art of War in the Middle Ages A.D. 378-1515|C. W. C. Oman