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The second declension contains two types of masculine Greek nouns and one form of neuter Greek noun. These nouns are irregular only in the singular, as are their first-declension counterparts. Greek nouns in the second declension are derived from the Omicron declension. Some Greek nouns may also be declined as normal Latin nouns.
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.
Adjectives vary according to gender, and in most cases only the lemma form (nominative singular masculine form) is listed here. 1st-and-2nd-declension adjectives end in -us (masculine), -a (feminine) and -um (neuter), whereas 3rd-declension adjectives ending in -is (masculine and feminine) change to -e (neuter).
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 declension of nouns in Latin that are borrowed from Greek varies significantly between different types of nouns, though certain patterns are common. Many nouns, particularly proper names , in particular, are fully Latinized and declined regularly according to their stem-characteristics.
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 .)
Although the a of the Greek and Latin first declension was not originally a thematic vowel, it is considered one in Greek and Latin grammar. In both languages, first-declension nouns take some endings belonging to the thematic second declension. An a-stem noun was originally a collective noun suffixed with -eh₂, the ending of the neuter plural.