From Iā̆pōnia (“Japan”) + -us.
iā̆pōnus (feminine iā̆pōna, neuter iā̆pōnum); first/second-declension adjective
First/second-declension adjective.
singular | plural | ||||||
---|---|---|---|---|---|---|---|
masculine | feminine | neuter | masculine | feminine | neuter | ||
nominative | iā̆pōnus | iā̆pōna | iā̆pōnum | iā̆pōnī | iā̆pōnae | iā̆pōna | |
genitive | iā̆pōnī | iā̆pōnae | iā̆pōnī | iā̆pōnōrum | iā̆pōnārum | iā̆pōnōrum | |
dative | iā̆pōnō | iā̆pōnae | iā̆pōnō | iā̆pōnīs | |||
accusative | iā̆pōnum | iā̆pōnam | iā̆pōnum | iā̆pōnōs | iā̆pōnās | iā̆pōna | |
ablative | iā̆pōnō | iā̆pōnā | iā̆pōnō | iā̆pōnīs | |||
vocative | iā̆pōne | iā̆pōna | iā̆pōnum | iā̆pōnī | iā̆pōnae | iā̆pōna |