The Collaborative International Dictionary of English v.0.48:

Leprous \Lep"rous\ (-r[=u]s), a. [OF. leprous, lepros, F.
   l['e]preux, fr. L. leprosus, fr. lepra, leprae, leprosy. See
   Leper.]
   [1913 Webster]
   1. Infected with leprosy; pertaining to or resembling
      leprosy. "His hand was leprous as snow." --Ex. iv. 6.
      [1913 Webster]

   2. (Nat. Hist.) Leprose.
      [1913 Webster] -- Lep"rous*ly, adv. -- Lep"rous*ness,
      n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

leprous
    adj 1: relating to or resembling or having leprosy