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reredos (n.)

"decorated screen behind an altar; brick or stone back of a fireplace," late 14c., rere-dose, from Anglo-French rere-, an archaic combining form of rear (n.), + dos "back" (see dossier). But Klein's sources suggest it is aphetic of Anglo-French areredos, from Old French arere "at the back" (Modern French arrière). For rere-, compare rere-main "a backhand stroke" (c. 1300), rere-supper "a late supper after the ordinary meal."

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Definitions of reredos from WordNet

reredos (n.)
a painted or carved screen placed above and behind an altar or communion table;
Synonyms: altarpiece
From wordnet.princeton.edu