
A predella is the platform or step on which an altar stands (*predel or *pretel langobardic = a low wooden platform that serves as a basis in a piece of furniture). In painting, the predella is the painting or sculpture along the frame at the bottom of an altarpiece. In later medieval and Renaissance altarpieces, where the main panel consisted of ...
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http://en.wikipedia.org/wiki/Predella

platform for altar; portable altar or decoration upon it
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http://phrontistery.info/p.html

• (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.
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http://thinkexist.com/dictionary/meaning/predella/

Pedestal or lower part of a retable.
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http://www.artbible.info/art/glossary.html

A series of small images or carvings at the base of an altarpiece.
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http://www.artisansofthevalley.com/comm_gloss3.html

Base of an altarpiece, often painted with a series of incidents connected with the subjects of the main panels; for example, scenes from a saint's life. ...
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http://www.encyclo.co.uk/local/20688
Pre·del'la noun [ Italian ] 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.
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http://www.encyclo.co.uk/webster/P/146

Platform surrounding an altar.
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http://www.selectstone.com/architectural-resources/stone-glossary/

the base of an altarpiece, often decorated with small paintings or reliefs.
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https://www.infoplease.com/dictionary/predella
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