Bible Encyclopedias
Triplet

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

a window of three lights. Many such occur in the First Pointed style, the center light being usually longer or more elevated than the two side lights.

Bibliography Information
McClintock, John. Strong, James. Entry for 'Triplet'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​t/triplet.html. Harper & Brothers. New York. 1870.