Origin of distention
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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).
Online Etymology Dictionary, © 2010 Douglas Harper
The act of distending or the state of being distended.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.