noun Pathology.

  1. an intestinal disorder characterized by abnormal frequency and fluidity of fecal evacuations.

late 14c., from Old French diarrie, from Late Latin diarrhoea, from Greek diarrhoia “diarrhea” (coined by Hippocrates), literally “a flowing through,” from diarrhein “to flow through,” from dia- “through” (see dia-) + rhein “to flow” (see rheum). Respelled 16c. from diarria on Latin model.


  1. Excessive and frequent evacuation of watery feces.

  1. Excessive and frequent evacuation of watery feces, usually a symptom of a gastrointestinal disorder. Severe, prolonged diarrhea can lead to dehydration.

The frequent passage of abnormally watery feces, which is a sign of illness.

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