Fifth Declension Nouns: -ei

* Feminine nouns (series -ēi f.) acies -ēi f. line of battle dies -ēi f. day fides -ĕi f. faith/trust/fidelity/promise/guarantee glacies -ēi f. ice pernicies -ēi f. utter ruin planities -ēi f. plain progenies -ēi f. offspring res -ĕi f. thing/matter/event/fact series -ēi f. series/succession spes -ēi f. hope species -ēi f. appearance/figure/shape * Masculine nouns (meridies -ēi m.) dies -ēi m. day meridies -ēi m. mid-day