distension

dis·ten·tion also dis·ten·sion   (dĭ-stěn'shən)    n.  The act of distending or the state of being distended. [Middle English distensioun, from Old French, from Latin distēnsiō, distēnsiōn-, alteration of distentiō, from distentus, past participle of distendere, to distend; see distend.]

Main Entry: dis·ten·sion
Variant: or dis·ten·tion /dis-'ten-ch&n/
Function: noun
: the act of distending orthe state of being distended especially unduly or abnormally <distension of the abdomen, vomiting, and localized pain and swelling —Morris Fishbein>

distention dis·ten·tion or dis·ten·sion (dĭ-stěn'shən)
n.
The act of distending or the state of being distended.