The outer vestment worn by the priest in saying Mass,
   consisting, in the Roman Catholic Church, of a broad, flat, back piece,
   and a narrower front piece, the two connected over the shoulders only.
   The back has usually a large cross, the front an upright bar or pillar,
   designed to be emblematical of Christ's sufferings. In the Greek Church
   the chasuble is a large round mantle.