The Collaborative International Dictionary of English v.0.48:

Nephritic \Ne*phrit"ic\, Nephritical \Ne*phrit"ic*al\, a. [L.
   nephriticus, Gr. nefritiko`s: cf. F. n['e]phr['e]tique. See
   Nephritis.]
   1. Of or pertaining to the kidneys or urinary organs; renal;
      as, a nephritic disease.
      [1913 Webster]

   2. (Med.)
      (a) Affected with a disease of the kidneys; as, a
          nephritic patient.
      (b) Relieving disorders of the kidneys; affecting the
          kidneys; as, a nephritic medicine.
          [1913 Webster]

   3. Of or pertaining to nephrite.
      [PJC]

   Nephritic stone (Min.), Nephrite; jade. See Nephrite.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nephritic \Ne*phrit"ic\, n. (Med.)
   A medicine adapted to relieve or cure disease of the kidneys.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nephritic
    adj 1: affected by nephritis
    2: of or relating to the kidneys [syn: nephritic, renal]