The story
- Ancient Greek · derived fromβαπτιστήριον
- Ecclesiastical Latin · derived frombaptistērium
- Middle English · inherited frombaptistery
- English todaybaptistry
From Middle English baptistery, baptisterie, from Ecclesiastical Latin baptistērium, from Ancient Greek βαπτιστήριον (baptistḗrion); equivalent to baptism + -ry.
Etymology from Wiktionary, CC BY-SA 4.0.