Acroterion (It. acroterio): decorative protrusion atop the pediment of an Etruscan, Greek or Roman temple. At the bottom corners of the pediment such a decoration would be called an antefix.
Ambone: a pulpit, often elaborately decorated
Ambulatory (It. ambulatorio): curving aisle around the apse of a church, usually lined with chapels
Ancona: a painted or sculpted altarpiece, especially one set in an architectural frame
Atrium (It. atrio): entrance court of an ancient Roman house or an early church
Arca: a monumental tomb or sarcophagus
Badia (from abbazia): an abbey or abbey church
Baldacchino: baldachin, a columned stone canopy over an altar
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