The Collaborative International Dictionary of English v.0.48:
Cuish \Cuish\ (kw?s), n. [F. cuisse thigh, fr. L. coxa hip: cf. F. cuissard, OF, cuissot, armor for the thigh, cuish. Cf. Hough.] Defensive armor for the thighs. [ Written also cuisse, and quish.] [1913 Webster]WordNet (r) 3.0 (2006):
cuisse n 1: armor plate that protects the thigh