WordReference Random House Unabridged Dictionary of American English © 2017
Sanc•tus  (sangktəs),USA pronunciation n. 
  1. Music and Dance, Religion(italics) Also called  Tersanctus. the hymn beginning "Holy, holy, holy, Lord God of hosts,'' with which the Eucharistic preface culminates.
  2. Music and Dancea musical setting for this hymn.
  • Latin sānctus holy, hallowed (past participle of sancīre to hallow), the first word of the hymn

Collins Concise English Dictionary © HarperCollins Publishers::

Sanctus /ˈsæŋktəs/ n
  1. 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
Etymology: 14th Century: from the first word of the hymn, Sanctus sanctus sanctus Holy, holy, holy, from Latin sancīre to consecrate

'Sanctus' also found in these entries:

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