altarpiece

plural of altarpiece n

a painting or carving (especially an altarpiece) on two panels (usually hinged like a book)

A picture, or combination of pictures, consisting of a centerpiece and double folding doors or wings, as for an altarpiece.

hence, in Italian painting, a band or frieze of several pictures running along the front of a superaltar, or forming a border or frame at the foot of an altarpiece.

art consisting of a painting or carving (especially an altarpiece) on three panels (usually hinged together)