A medical condition characterized by frequent, loose, or watery bowel movements. The British spelling of diarrhea.
From Greek diarrhoia, combining dia ('through') and rhein ('to flow'). Literally means 'a flowing through'. The term was used by ancient Greek physicians including Hippocrates to describe the condition.
The ancient Greeks were remarkably direct in their medical terminology - diarrhoea literally means 'flowing through', which is exactly what happens. The spelling difference between British 'diarrhoea' and American 'diarrhea' reflects broader patterns in medical terminology, with British English often preserving more of the original Greek spelling.
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