(n.) The painting or piece of sculpture above and behind the altar; reredos.

Communion table abstract abstraction altar altar carpet altar desk altar facing altar of prothesis altar rail altar side altar slab altar stair altar stone ancona block print bomos chancel table collage color print copy credence cyclorama daub diptych engraving eschara fresco frontal gradin hestia holy table icon illumination illustration image likeness mensal miniature missal stand montage mosaic mural panorama photograph picture predella print prothesis representation reproduction retable retablo rood altar scrobis stained glass window stencil still life superaltar tableau tapestry triptych wall painting