predella
Concise Oxford English Dictionary © 2008 Oxford University Press:
predella /prɪˈdɛlə/
▶noun a step or platform on which an altar is placed.
■ a raised shelf above an altar.
■ a painting or sculpture on this, typically forming an appendage to an altarpiece.
– origin C19: from Ital., lit. ‘stool’.
'predella' also found in these Oxford entries:

