Latin word pugnus comes from Ancient Greek πυγμή

Detailed word origin of pugnus

Dictionary entry	Language	Definition
πυγμή	Ancient Greek (grc)
*peuǵ-	Proto-Indo-European (ine-pro)
*puḱnos	Proto-Indo-European (ine-pro)
*pugnos	Proto-Italic (itc-pro)
pugnus	Latin (lat)	A fist; a hand with all fingers curled up. A fistful, handful.

Words with the same origin as pugnus