What does "altar" mean?

Altar: 2. In the Christian church, a construction of stone, wood, or other material for the celebration of the Holy Eucharist; the communion table. Note: Altar is much used adjectively, or as the first part of a compound; as, altar bread or altar-bread. Altar cloth or Altar-cloth, the cover for an altar in a Christian church, usually richly embroidered. -- Altar cushion, a cushion laid upon the altar in a Christian church to support the service book. -- Altar frontal. See Frontal. -- Altar rail, the railing in front of the altar or communion table. -- Altar screen, a wall or partition built behind an altar to protect it from approach in the rear. -- Altar tomb, a tomb resembling an altar in shape, etc. -- Family altar, place of family devotions. -- To lead (as a bride) to the altar, to marry; -- said of a woman.