-plus
From Proto-Italic *-plos, cognate with Ancient Greek -πλόος (-plóos) or -πλός (-plós) (as in διπλός (diplós)), the second element of Old Irish díabul (“double”)[1] and possibly Proto-Germanic *twīflaz (“Zweifel”). From an unclear root of the form *pl(H), possibly from Proto-Indo-European *pleh₁- (“to fill”) or Proto-Indo-European *pelh₂- (“to approach”)[1] or Proto-Indo-European *pel- (“to fold”), source of Proto-Germanic *-falþaz (“-falte”).[2] Compare also -plex.
-plus (feminine -pla, neuter -plum); first/second-declension suffix
First/second-declension adjective.
| Number | Singular | Plural | |||||
|---|---|---|---|---|---|---|---|
| Case / Gender | Masculine | Feminine | Neuter | Masculine | Feminine | Neuter | |
| Nominative | -plus | -pla | -plum | -plī | -plae | -pla | |
| Genitive | -plī | -plae | -plī | -plōrum | -plārum | -plōrum | |
| Dative | -plō | -plō | -plīs | ||||
| Accusative | -plum | -plam | -plum | -plōs | -plās | -pla | |
| Ablative | -plō | -plā | -plō | -plīs | |||
| Vocative | -ple | -pla | -plum | -plī | -plae | -pla | |