Home › Words › H › hyperoonhyperoonhyperoon · noun — an upper room.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, hyperoon ranks #37,363 of 42,820 for Qualifying.EtymologyFrom Ancient Greek ὑπερῷον (huperōîon).nounAn upper room.Definitions & examples from Wiktionary (CC BY-SA 3.0).