What is the meaning of Reredos?

A screen or decoration behind the altar in a church, usually depicting religious iconography or images, akin to the iconostasis of the Eastern Churches.

The back of an open fire-hearth, in medieval halls and in some later architecture inspired by them.

A reredos or retable; a panel at the back of an altar.

A dorsal; a hanging or tapestry at the back of an altar.

The back of a fireplace or hearth.

A wood screen against the back of a chair or wall.

A panel of armour for protecting the rear.

The rearguard of an army.

Source: wiktionary.org