DIARRHOEA Meaning of DIARRHOEA in English n. (esp. US diarrhea) a condition of excessively frequent and loose bowel movements. Derivatives: diarrhoeal adj. diarrhoeic adj. Etymology: ME f. LL f. Gk diarrhoia (as DIA-, rheo flow) Oxford English vocab. Оксфордский английский словарь. 2012