The Collaborative International Dictionary of English v.0.48:
Misericorde \Mis"er*i*corde"\, n. [F. mis['e]ricorde. See Misericordia.] [1913 Webster] 1. Compassion; pity; mercy. [Obs.] [1913 Webster] 2. (Anc. Armor.) Same as Misericordia, 2. [1913 Webster]The Devil's Dictionary (1881-1906):
MISERICORDE, n. A dagger which in mediaeval warfare was used by the foot soldier to remind an unhorsed knight that he was mortal.