An excessive discharge or flux from the abdomen; diarrhea or abnormal bowel discharge (alternative British spelling).
From Greek koilios (belly) + rhoia (flow, discharge). The British variant spelling using 'oe' instead of 'e' and 'rh' instead of 'r', preserving classical Greek orthography.
This is just the fancy British spelling of the same condition using 'oe' and 'rh' to be more faithful to the original Greek—imagine writing 'diarrhoea' instead of 'diarrhea.'
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