Origin of distention
Examples from the Web for distension
The distension of these sinuses with blood closes the valve and prevents regurgitation.Manual of Surgery|Alexis Thomson and Alexander Miles
The only other interference with Nature is the distension of the ear-lobes in the older men of the hill districts.The Fijians|Basil Thomson
At the last-named location the distension is so great that the mass can be readily felt through the abdominal walls.
This kind of ant has a distension of the abdomen in which honey is stored by the workers for cases of need.
It is an expression that seems to me capable of extension and distension.Personal Reminiscences in Book Making|R.M. Ballantyne
also distension, early 15c., from Middle French distension and directly from Latin distensionem (nominative distensio, distentio), noun of action from past participle stem of distendere (see distend).