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

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "leprous":
   allergic, anemic, apoplectic, arthritic, bilious, cancerous,
   chlorotic, colicky, consumptive, dropsical, dyspeptic, edematous,
   encephalitic, epileptic, laryngitic, luetic, malarial, malignant,
   measly, nephritic, neuralgic, neuritic, palsied, paralytic,
   phthisic, pleuritic, pneumonic, pocky, podagric, rachitic,
   rheumatic, rickety, scorbutic, scrofulous, tabetic, tabid,
   tubercular, tuberculous, tumorigenic, tumorous