The Collaborative International Dictionary of English v.0.48:
Leper \Lep"er\ (l[e^]p"[~e]r), n. [OE. lepre leprosy, F. l[`e]pre, L. leprae, lepra, fr. Gr. le`pra, fr. lepro`s scaly, fr. le`pos scale, le`pein to peel.] A person affected with leprosy. [1913 Webster]WordNet (r) 3.0 (2006):
leper n 1: a person afflicted with leprosy [syn: leper, lazar] 2: a pariah who is avoided by others