noun: (Christianity) A liturgical prayer that (in it's English translation) runs “Holy God, Holy Mighty, Holy Immortal, have mercy on us”, typically sung before certain scriptural readings at Eucharistic liturgies in Eastern Christianity, and during the Good Friday Mass in the Roman Rite.
noun: Alternative letter-case form of Trisagion [(Christianity) A liturgical prayer that (in it's English translation) runs “Holy God, Holy Mighty, Holy Immortal, have mercy on us”, typically sung before certain scriptural readings at Eucharistic liturgies in Eastern Christianity, and during the Good Friday Mass in the Roman Rite.]
