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.
Latin Nouns: Second Declension Greek Nouns
Endings (-os, -ōs, -on)
Masculine/Feminine -os
| Case | Singular | Plural |
|---|---|---|
| Nominative | -os | -ī |
| Genitive | -ī | -ōrum |
| Dative | -ō | -īs |
| Accusative | -on | -ōs |
| Vocative | -e | -ī |
| Ablative | -e | -īs |
Masculine/Feminine -ōs
| Case | Singular | Plural |
|---|---|---|
| Nominative | -ōs | -ae |
| Genitive | -ō/ī | -orum |
| Dative | -ō | -īs |
| Accusative | -ō/ōn | -ōs |
| Vocative | -ōs | -ī |
| Ablative | -ō | -īs |
Neuter -on
| Case | Singular | Plural |
|---|---|---|
| Nominative | -on | -ī |
| Genitive | -ī | -ōrum |
| Dative | -ō | -īs |
| Accusative | -on | -ōs |
| Vocative | -on | -ī |
| Ablative | -ō | -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 |