Webster's English Dictionary

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sanctus

Sanc.tus \'san(k)-t*s; 'sa:n(k)-t*s, -.tu:s\ n [ME, fr. LL Sanctus, 
   sanctus, sanctus Holy, holy, holy, openi]ng of a hymn sung by the angels in 
   Isa 6:3 : an ancient Christian hymn closing the preface of most Christian 
   liturgie s and commencing with the words Sanctus, sanctus, sanctus or Holy, 
   holy, holy