Charles Buck Theological Dictionary
The place in which the ceremony of baptism is performed. In the ancient church, it is said, it was generally a building separate, and distinct from the church. It consisted of an ante-room, where the adult persons to be baptized made their confession of faith; and an inner room, where the ceremony of baptism was performed. Thus it continued to the sixth century, when the baptisteries began to be taken into the church.
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Buck, Charles. Entry for 'Baptistry'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/b/baptistry.html. 1802.