Trisagion

noun
Tris·agion | \trēˈsȧyȯn\
plural Trisagia\-yȧ \

Definition of Trisagion 

1 : a hymn to or invocation of God as the thrice holy the Trisagion of Isa 6:3

2 : a requiem service of the Eastern Church

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History and Etymology for Trisagion

Middle Greek, from neuter of Late Greek trisagios thrice holy, from Greek tris- + hagios holy

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