Trisagion

Meanings

1. A liturgical prayer that runs “Holy God, Holy Mighty, Holy Immortal, have mercy on us” in English, typically sung before certain scriptural readings at Eucharistic liturgies in Eastern Christianity, and during the Good Friday service in the Roman Rite.
2. The kedushah prayer, or Isaiah 6:3 specifically.

1. Alternative letter-case form of Trisagion.

Etymology

From Medieval Latin trisagion, from Byzantine Greek τρισάγιον (triságion), from τρίς (trís, “thrice”) + ἅγιον (hágion, “holy”).