A drapery that covers the front of an altar WordNet 3.0 & Open English WordNet

An antependium, also known as a pulpit fall, parament or hanging, or, when speaking specifically of the hanging for the altar, an altar frontal, is a decorative piece, usually of textile, but also metalwork, stone or other material that can adorn a Christian altar. Wikipedia

Decorative piece, usually of textile, but also metalwork, stone or other material that can adorn a Christian altar. Wikidata

The hangings or screen in front of the altar; an altar cloth; the frontal. Wiktionary

The hangings in front of the altar. Wiktionary (translation)

A drapery covering the front of an altar. Wiktionary

Drapery covering the front of an altar. Wiktionary (translation)