Etymology tree Proto-Indo-European *weh₁y-? Proto-Indo-European *-ō? Proto-Indo-European *wéyh₁ō Proto-Italic *wīnom Latin vīnum Old French vin Proto-Indo-European *h₂eḱ- Proto-Indo-European *-rós Proto-Indo-European *h₂eḱrós Proto-Italic *akris Classical Latin ācer Late Latin ācrus Old French aigre Old French vinaigre Middle French vinaigre French vinaigre Proto-Indo-European *-tós Proto-Italic…