Bible Dictionaries
Trisagion
The American Church Dictionary and Cyclopedia
A Greek word meaning the same as Ter Sanctus, i.e., "Thrice Holy," but it is not used in the Greek Church for the same thing, but is the title of the respond used in the Reproaches and other services, namely, "Holy God, Holy and Mighty, Holy and Immortal, have mercy upon us."
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Bibliography Information
Miller, William James. Entry for 'Trisagion'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/t/trisagion.html. 1901.