altar: In the Roman Church, a table at which the celebration of the Eucharist takes place. It is placed in a prominent place in the church, usually at the east end, in the choir or sanctuary, facing the main entrance to the church.
See also choir, retable
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Image adapted from M. Viollet-le-Duc, Dictionnaire Raisonné de l'Architecture Française du XIe au XVIe Siècle, Vol. 2, p 46.