(italics). Also called Tersanctus. the hymn beginning “Holy, holy, holy, Lord God of hosts,” with which the Eucharistic preface culminates.
2.
a musical setting for this hymn.
Origin
< Latinsānctus holy, hallowed (past participle of sancīre to hallow), the first word of the hymn
British Dictionary definitions for Sanctus
Sanctus
/ˈsæŋktəs/
noun
1.
(liturgy) the hymn that occurs immediately after the preface in the celebration of the Eucharist
2.
a musical setting of this, usually incorporated into the Ordinary of the Roman Catholic Mass
Word Origin
C14: from the first word of the hymn, Sanctus sanctus sanctus Holy, holy, holy, from Latin sancīre to consecrate
Word Origin and History for Sanctus
n.
late 14c., Latin, initial word of the "angelic hymn" (Isa. vi:3), concluding the preface of the Eucharist, literally "holy" (see saint (n.)). It renders Hebrew qadhosh in the hymn.