The Collaborative International Dictionary of English v.0.48:

Aplastic anemia \A*plas"tic a*ne"mi*a\, n. [from aplasia[2].]
   (Med.)
   an anemia characterized by substantial reduction or cessation
   of production of red blood cells and hemoglobin by the bone
   marrow. --Stedman

   Syn: Ehrlich's anemia; anemia gravis.
        [PJC]

WordNet (r) 3.0 (2006):

aplastic anemia
    n 1: anemia characterized by pancytopenia resulting from failure
         of the bone marrow; can be caused by neoplasm or by toxic
         exposure [syn: aplastic anemia, aplastic anaemia]