Bible Dictionaries
Sanctus

Webster's Dictionary

(1):

(n.) 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.

(2):

(n.) An anthem composed for these words.

Bibliography Information
Webster, Noah. Entry for 'Sanctus'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/sanctus.html. 1828.