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The latter class, i.e. the neuter nominative/accusative singular, usually ends with -um in Latin and -ον (-on) in Greek, matching the accusative of the former. In Latin, the masculine words of the second declension that end with -us in the nominative case are differently declined from the latter in the vocative case: such words end with -e.
The declension looks alike the first noun declension for the feminine and the second noun declension for the masculine and neuter. Adjectives ending -ius use the vocative -ie ( ēbrie , "[O] drunk man", vocative of ēbrius ), just as in Old Latin all -ius nouns did ( fīlie , "[O] son", archaic vocative of fīlius ).
A few 2nd declension nouns, such as vir "man" and puer "boy", lack endings in the nominative and vocative singular. In the 2nd declension, the genitive plural in some words is optionally -um, especially in poetry: [5] [6] deum or deōrum "of the gods", virum or virōrum "of men". Neuter nouns such as bellum "war" have -a in the nominative ...
The ablative singular is -e, but the plural follows the i-stem declension with genitive -ium and neuter plural -ia. The perfect passive participle is declined like a 1st and 2nd declension adjective. In all conjugations, the perfect participle is formed by removing the –um from the supine, and adding a –us (masculine nominative singular).
The second or omicron declension is thematic, with an -ο or -ε at the end of the stem. It includes one class of masculine and feminine nouns and one class of neuter nouns. When a second-declension noun is accented on the ultima, the accent switches between acute for the nominative, accusative, and vocative, and circumflex for the genitive and ...
Neuter words in the nominative and accusative plural have the endings -α (-a) or -η (-ē). They are divided into the 2nd and 3rd declensions according to the endings of their genitive and dative cases, which are the same as those of masculine nouns. τὰ δένδρα (tà déndra) "the trees" – 2nd declension
The Latin word vīrus was a neuter noun of the second declension, but neuter second declension nouns ending in -us (rather than -um) are rare enough that inferring rules is difficult. (One rare attested plural, pelage as a plural of pelagus , is borrowed from Greek, so does not give guidance for virus .)
Most neuter nouns end either in -ο [-o] (plural: -α [-a]) or -ι [-i] (plural: -ιά [-ia]). Indeed, most of them that end in -i initially ended in -io, an ending for diminutives that many nouns had acquired already from Koine Greek. As a result, the endings of the plural and of the genitive singular are reminiscent of those older forms.