1. (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.

2. (n.) An anthem composed for these words.

Agnus Dei Alleluia Anamnesis Blessing Canon Collect Communion Consecration Credo Dismissal Epistle Fraction Gloria Gospel Gradual Introit Kyrie Kyrie Eleison Last Gospel Lavabo Offertory Paternoster Pax Post-Communion Preface Secreta Tersanctus Tract