-ų

• -ių

From Proto-Balto-Slavic *-um; compare Latvian -u, Old Prussian -an -un, Proto-Slavic *-ъ, exemplifying a Balto-Slavic shortening and raising of Proto-Indo-European *-ōm; compare Sanskrit -आम् (-ām), Ancient Greek -ων (-ōn), Old Norse -a. According to Eugen Hill, this shortening was regular before final *-N in Balto-Slavic (compare feminine accusative singular -ą); whereas *o was raised to *u in stressed final syllables. Compare -ù (“instrumental singular ending”); see -ùs for more.^[1]

-ų̃

1. Used to form genitive plurals of masculine and feminine nouns and adjectives.

• -ųjų