The term 'ALTAR screen' can be broken down into three parts: reredos (7 letters), ara (3 letters), and APSE (4 letters). A reredos is a large, ornamental screen or wall behind an ALTAR in a church. An ara is a Latin word meaning 'ALTAR, ' and an APSE is a semicircular recess in the wall of a church, usually at the east end. ALTAR screens are typically made up of these three components, and are used to separate the ALTAR from the rest of the church.