Latin Nouns: Second Declension Greek Nouns

Endings (-os, -ōs, -on)

Masculine/Feminine -os

Case Singular Plural
Nominative -os
Genitive -ōrum
Dative -īs
Accusative -on -ōs
Vocative -e
Ablative -e -īs

Masculine/Feminine -ōs

Case Singular Plural
Nominative -ōs -ae
Genitive -ō/ī -orum
Dative -īs
Accusative -ō/ōn -ōs
Vocative -ōs
Ablative -īs

Neuter -on

Case Singular Plural
Nominative -on
Genitive -ōrum
Dative -īs
Accusative -on -ōs
Vocative -on
Ablative -īs

Examples

barbitos, lyre
Case Singular Plural
nom. barbitos barbitī
gen. barbitī barbitōrum
dat. barbitō barbitīs
acc. barbiton barbitōs
voc. barbite barbitī
abl. barbitō barbitīs
Androgeōs, Androgeos (person)
Case Singular Plural
nom. Androgeōs Androgeī
gen. Androgeī Androgeōrum
dat. Androgeō Androgeīs
acc. Androgeō/ōn Androgeōs
voc. Androgeōs Androgeī
abl. Androgeā Androgeīs
Īlion, Troy (Greek city state)
Case Singular Plural
nom. Īlion Īliī
gen. Īliī Īliōrum
dat. Īliō Īliīs
acc. Īliōn Īliīs
voc. Īliōn Īliī
abl. Īliō Īliīs

Additional Notes

The ŏ-stem Migration

Most of these nouns evolved into second declension ŏ-stem counterparts that are more often used. For example, atomos became atomus, and Illion became Illium.

Recommended Latin Grammar Reading