baptistery
baptistery also baptistry (băpʹtĭ-strē) noun
plural baptisteries also baptistries
1. A part of a church or a separate building used for baptizing.
2. A font used for baptism.
[Middle English baptisterie, from Old French, from Late Latin baptistērium, from Greek baptistērion, from baptizein, to baptize. See baptize.]