he following terms are taken from Medical Etymology. The History and Derivations of
Medical Terms for Studens of Medicine,Dentistry, and Nursing. By: O.H. Perry Pepper, M.D.
Professor of Medicine, University of Pennsylvania.

abdomen The orgin of this term is not known. Perhaps it is derived from the Latin abdere = to hide;
hence it might mean the cavity in which odds and ends are hidden away. Others believe it has
come from the Latin root adeps = fat.

http://www.emory.edu/ANATOMY/AnatomyManual/Etymology.html