WordReference Random House Learner's Dictionary of American English © 2019
di•ar•rhe•a or  di•ar•rhoe•a /ˌdaɪəˈriə/USA pronunciation   n. [uncountable]
  1. Pathologyan intestinal disorder characterized by frequent and loose bowel movements:a bad case of diarrhea.

WordReference Random House Unabridged Dictionary of American English © 2019
di•ar•rhe•a  (dī′ə rēə),USA pronunciation n. [Pathol.]
  1. Pathologyan intestinal disorder characterized by abnormal frequency and fluidity of fecal evacuations.
Also,  di′ar•rhoea.  di′ar•rheal, di′ar•rheic, di•ar•rhet•ic  (dī′ə retik),USA pronunciation  di′ar•rhoeal, di′ar•rhoeic, di′ar•rhoetic, adj. 
  • Greek diárrhoia a flowing through, equivalent. to diarrho- (variant stem of diarrheîn to flow through) + -ia -ia
  • Late Latin diarrhoea
  • 1350–1400; Middle English diaria

Collins Concise English Dictionary © HarperCollins Publishers::

diarrhoea, esp US diarrhea /ˌdaɪəˈrɪə/ n
  1. frequent and copious discharge of abnormally liquid faeces
Etymology: 16th Century: from Late Latin, from Greek diarrhoia, from diarrhein to flow through, from dia- + rhein to flow

ˌdiarˈrhoeal, ˌdiarˈrhoeic, esp US ˌdiarˈrheal, ˌdiarˈrheic adj

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