出典:Wiktionary
Of the major English dictionaries that enter pernio at all, most enter only perniones for the plural form. As with other words naturalized into English from ancient Latin or New Latin, the Latin plural inflection and the English plural inflection have both been used, and there is no general rule for which one is considered preferable, as preference varies by word, dictionary, academic field, and commentator (e.g., fibulae versus fibulas, formulae versus formulas, femora versus femurs).
Third-declension noun.
| Case | Singular | Plural |
|---|---|---|
| Nominative | perniō | perniōnēs |
| Genitive | perniōnis | perniōnum |
| Dative | perniōnī | perniōnibus |
| Accusative | perniōnem | perniōnēs |
| Ablative | perniōne | perniōnibus |
| Vocative | perniō | perniōnēs |