The story
- Medieval Greek · derived fromτρισάγιον
- Medieval Latin · borrowed fromtrisagion
- English todayTrisagion
From Medieval Latin trisagion, from Medieval Greek τρισάγιον (triságion), from τρίς (trís, “thrice”) + ἅγιον (hágion, “holy”).
Etymology from Wiktionary, CC BY-SA 4.0.