This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A raised step near the base of a Christian altar.

n. A series of carvings or paintings on this step, often forming a narrative.

n. The step, or raised secondary part, of an altar; a superaltar; 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.

n. Same as gradino.

"On the predella, which is divided into three parts, were once various scenes from the life of St. Nicholas of Bari, two of these are now to be found in the Vatican Gallery."

superaltar   

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