Double Autrar.—An altar having a double front, constructed in such a manner that Mass may be celebrated on both sides of it at the same time. They are frequently found in churches of religious communities in which the choir is behind the altar, so that whilst one priest is celebrating the Holy Sacrifice for the community in choir, another may celebrate for the laity assembled in the church.
The Catholic Encyclopedia
Double Altar
1 section
Charles G. Herbermann and others (editors)
Transcribed from a dated scan; artifacts may remain. Edition notes
Trans. None. Written in English by the contributors whose signatures close each article., The Catholic Encyclopedia, An International Work of Reference on the Constitution, Doctrine, Discipline, and History of the Catholic Church, in fifteen volumes, 1907. Public domain.