Bible Encyclopedias
Responsorii, Psalmi

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

mean either the repetition of the verses by the people, or the repetition of the last words of the psalm, with the addition of the "amen" or the doxology; or that the psalms were so selected as to correspond to the subject of the lessons which had been read. Eadie, Eccles. Cyclop. s.v. "Psalmody."

Bibliography Information
McClintock, John. Strong, James. Entry for 'Responsorii, Psalmi'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​r/responsorii-psalmi.html. Harper & Brothers. New York. 1870.