Reredos

A reredos (/ˈrɪərˌdɒs, ˈrɪərɪ-, ˈrɛrɪ-/ REER-dos, REER-ih-, RERR-ih-) is a large altarpiece, a screen, or decoration placed behind the altar in a church. It often includes religious images.

The term reredos may also be used for similar structures, if elaborate, in secular architecture, for example very grand carved chimneypieces. It also refers to a simple, low stone wall placed behind a hearth.