Mĭs'er-i-cōr'di-a, n.

noun

n. [Lat., mercy, compassion.]

(O. Law.) An amercement. Burrill.
(Anc. Armor.) A narrow-bladed dagger used by a knight in the middle ages;—so called because employed against a dismounted adversary whom he had forced to cry for mercy.
(Arch.) See MISERERE.