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1911 Encyclopedia Britannica
(through Fr. sacristie, from med. Lat. sacristia or sacristina), the term in ecclesiastical architecture given to the room or hall in a large church wherein are kept the vestments and utensils (sacra) used in the services and celebrations. Like the diaconicon in the Greek Church, it was usually situated on the north side of the chancel, but its position varies according to that of the chapter-house, as it is generally placed between the latter and the church.
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Chisholm, Hugh, General Editor. Entry for 'Sacristy'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/s/sacristy.html. 1910.