noun. A designated space within a church, or a separate room or building associated with a church, where a baptismal font is located, and consequently, where the sacrament of Christian baptism (via aspersion or affusion) is performed.

noun. An indoor pool used for baptism by immersion.

noun. bowl for baptismal water

"It was sometimes known as the baptistry because of its steep roof and pointed window and doorway and because it was built above a particularly pretty part of the river, where it flowed beneath a stone bridge before spilling over a short but steep waterfall."

basin  

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