Tris-āg'i-ŏn, n.

n. [Gr. τρισάγιος, thrice holy, from τρίς, thrice, and ἅγιος, holy.] An anthem or hymn in the liturgy ascribing holiness, in a threefold repetition of the word “holy,” to God;—called also Tersanctus, from the Latin title of the hymn. Hook.