·noun An anthem composed for these words.
II. Sanctus ·noun 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.
sanctus, a, um, Part. and P. a. of sancio. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
sānctus adj.with comp.and sup.P. of sancio, consecrated, established as inviolable, sacred, inviol...
An Elementary Latin Dictionary