Miserere

n.
  1. (R. C. Ch.) The psalm usually appointed for penitential acts, being the 50th psalm in the Latin version. It commences with the word miserere.
  2. A musical composition adapted to the 50th psalm.
  3. (Arch.) A small projecting boss or bracket, on the under side of the hinged seat of a church stall (see Stall). It was intended, the seat being turned up, to give some support to a worshiper when standing. Called also misericordia.
  4. (Med.) Same as Ileus.