Miserere

noun

1. A prayer for mercy.
2. An expression of lamentation or complaint.
3. A medieval dagger, used for the mercy stroke to a wounded foe; misericord.
4. A small projecting boss or bracket on the underside of the hinged seat of a church stall, intended to give some support to a standing worshipper when the seat is turned up; a misericord.
5. Ileus.