[ rɪ'teɪb(ə)l ]
(also retablo rɪ'tα:bləʊ )
■ noun ( plural ~s or retablos ) a frame enclosing decorated panels or a ledge for ornaments, above and behind an altar.
Origin
C19: from Fr. rétable , from Sp. retablo , from med. L. retrotabulum 'rear table'.