Welsh gwyar

← Avestan 𐬬𐬌𐬱- (cognate)

← Proto-Celtic *wēsarom (inherited)

← Ancient Greek ἰός (cognate)

← Ancient Greek ἰξός (mention)

← Proto-Indo-European *weys- (inherited)

← Latin virus (cognate)

← Latin viscum (mention)

← Sanskrit विष (cognate)

← Old Irish fi (cognate)

← Proto-Slavic *višьňa (cognate)