the psalm usually appointed for penitential acts, being the 50th psalm in the latin version. it commences with the word miserere.-a musical composition adapted to the 50th psalm.-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.-same as ileus.