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Altare / altari / altar: A structure with a flat top, often shaped like að table, that is used in some religious cermonies, for example as a place to put important religious objects.
Ornaturm / altaristafla / altarpiece: An altarpiece is a work of art in painting, sculpture or relief representing a religious subject made for placing at the backk of or behind the altar of a Christian church.
Wikipedia.