Baptisteries pl. : of Baptistry

Example:
Discuss the competition for the doors of the baptistery of the Cathedral of Florence.?

Taxonomy
baptisteries, Lateran baptistery, the church, newadvent, the Roman, Poole, polygonal, edifice, churches, diameter, Catholic Encyclopedia, the Sacrament, solemnly, portion, tank, aisle, The Catholic Encyclopedia, Sacrament of Baptism.

Defination from the web:
... Baptisteries had passed out of fashion. ...