From Proto-Italic *puos, from Proto-Indo-European *púH-os ~ *púH-es-os, from *puH-. Cognate with Sanskrit पुवस् (púvas), Ancient Greek πύον (púon), πύθω (púthō, “to rot”), Gothic 𐍆𐌿𐌻𐍃 (fuls, “foul”), Old English fūl (“foul”), English foul.
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