Tersanctus

From the Latin word Sanctus thrice said, the hymn is sometimes referred to as Tersanctus, and is thus apt to be confused with the triple Sanctus at the end of the preface at Mass.

The Catholic Encyclopedia, Volume 1: Aachen-Assize 1840-1916 1913

The Preface, i.e. the part beginning "It is meet and right," etc. The Tersanctus.

Studies in the Book of Common Prayer 1900

There is nothing so majestic in Protestant hymnology as this Tersanctus of Bishop Heber.

The Story of the Hymns and Tunes Theron Brown 1873

The various anthems, sentences and motets in all Christian languages bearing the titles "Trisagion" or "Tersanctus," and "Te Deum" are taken from portions of this royal hymn.

The Story of the Hymns and Tunes Theron Brown 1873

Having commemorated the passion, resurrection, and ascension of Christ, as he does also after the consecration, he calls on those present to join him in prayer, he says another prayer or prayers called the _secret_, because said in secret, and then recites the _preface_ to the canon, a prayer in which he unites with the celestial spirits in praise and thanksgiving as Christ himself gave thanks at the last supper: it concludes with the Tersanctus or

The Ceremonies of the Holy-Week at Rome Charles Michael Baggs