Sanctus n. : A part of the Mass, or, in Protestant churches, a part of the communion service, of which the first words in Latin are Sanctus, sanctus, sanctus [Holy, holy, holy]; -- called also Tersanctus.

Sanctus n. : An anthem composed for these words.

Example:
What are the english words to the Catholic Sanctus prayer? ?

Taxonomy
Sanctus, Prayers, Osana, Benedictus, Hosanna in the highest, free encyclopedia, the Roman, priest, Kadosh, the Trisagion, Preface, consecration, Hosanna in excelsis, the Mass, Marian Prayers, Eucharistic Prayer, venit, nomine Domini.

Defination from the web:
sanctus (Hosanna) · preface (sursum corda) · Canon of the Mass (texts & rubrics / history) · Words of ... Nicene Creed · Pater Noster · Sanctus · Signum Crucis. Marian Prayers ...