Relating to, characterized by, or causing diarrhea.
From Greek 'diarrhoia' + English suffix '-ic' (characterized by), an alternative form of 'diarrheal'.
Both 'diarrheal' and 'diarrheic' are used, but they're never both used equally—'diarrheal' is far more common in modern medicine, showing how English standardizes medical terminology over time.
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