Definition of diarrhoea noun from the Oxford Advanced Learner's Dictionary

 

diarrhoea

 noun
(British English)(North American English diarrhea)noun
BrE BrE//ˌdaɪəˈrɪə//
 
; NAmE NAmE//ˌdaɪəˈriːə//
 
(informal the runs)[uncountable] Healthy eating habits
 
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an illness in which waste matter is emptied from the bowels much more frequently than normal, and in liquid form Symptoms include diarrhoea and vomiting. See related entries: Healthy eating habits Word Origin late Middle English: via late Latin from Greek diarrhoia, from diarrhein ‘flow through’, from dia ‘through’ + rhein ‘to flow’.