DIARRHOEA Meaning of DIARRHOEA in English n. (esp. US diarrhea) a condition of excessively frequent and loose bowel movements. diarrhoeal adj. diarrhoeic adj.[ ME f. LL f. Gk diarrhoia (as DIA-, rheo flow) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012