Sanctus (n.)youdaoicibaDictYouDict[Sanctus 词源字典]
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.[Sanctus etymology, Sanctus origin, 英语词源]