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出典:Wiktionary
From quīntus (“fifth”) + -i- + sextus (“sixth”), calque of Byzantine Greek πενθέκτη (penthéktē), from πέντε (pénte) + ἕκτος (héktos), since the council was held to complete the fifth and sixth ecumenical councils.
quīnisextus (feminine quīnisexta, neuter quīnisextum); first/second-declension adjective
quinisextus