The Collaborative International Dictionary of English v.0.48:

Anaemia \A*n[ae]"mi*a\, Anemia
\A*ne"mi*a\([.a]*n[=e]"m[i^]*[.a]), a. [NL., fr. Gr. 'anaimi`a;
   'an priv. + a'i^ma blood.] (Med.)
   A morbid condition in which number of the red blood cells or
   concentration of hemoglobin decreases below that of normal.
   [1913 Webster + AS]

WordNet (r) 3.0 (2006):

anemia
    n 1: a deficiency of red blood cells [syn: anemia, anaemia]
    2: a lack of vitality [syn: anemia, anaemia]
    3: genus of terrestrial or lithophytic ferns having pinnatifid
       fronds; chiefly of tropical America [syn: Anemia, genus
       Anemia]

Moby Thesaurus II by Grady Ward, 1.0:

177 Moby Thesaurus words for "anemia":
   Christmas disease, Hand-Schuller-Christian disease,
   Letterer-Siwe syndrome, Lombardy leprosy, abscess, acute leukemia,
   adynamia, ague, angiohemophilia, ankylosis, anoxia,
   aplastic anemia, apnea, ariboflavinosis, ashiness, asphyxiation,
   asthma, ataxia, atony, atrophy, backache, beriberi, blah feeling,
   bleeding, blennorhea, bloodlessness, cachexia, cachexy,
   cadaverousness, chill, chills, chloranemia, chlorosis,
   chronic leukemia, colic, constipation, convulsion, coughing,
   cowardice, cyanosis, cyclic neutropenia, deathly hue,
   deathly pallor, debilitation, debility, deficiency anemia,
   dermatitis, diarrhea, dimness, dizziness, dropsy, dullness,
   dysentery, dyspepsia, dyspnea, edema, emaciation, erythrocytosis,
   etiolation, exsanguination, fadedness, fainting, faintness,
   fairness, fatigue, feebleness, fever, fibrillation, flabbiness,
   flaccidity, flux, ghastliness, goiter, greensickness, growth,
   haggardness, hemoglobinopathy, hemophilia, hemophilia A,
   hemophilia B, hemorrhage, high blood pressure, hydrops,
   hypertension, hypochromia, hypochromic anemia, hypotension,
   icterus, impotence, indigestion, infectious granuloma,
   inflammation, insomnia, iron deficiency anemia, itching, jaundice,
   keratomalacia, kwashiorkor, labored breathing, languishment,
   languor, lassitude, leukemia, leukemic reticuloendotheliosis,
   lightness, listlessness, lividness, low blood pressure, lumbago,
   macrocytic anemia, maidism, malnutrition, marasmus, muddiness,
   multiple myeloma, myelogenous leukemia, nasal discharge, nausea,
   necrosis, neutropenia, night blindness, osteomalacia, osteoporosis,
   pain, paleness, pallidity, pallidness, pallor, paralysis,
   pastiness, pellagra, pernicious anemia, plasma cell leukemia,
   plasmacytoma, polycythemia, prison pallor, prostration,
   protein deficiency, pruritus, pseudoleukemia, purpura,
   purpura hemorrhagica, rachitis, rash, rheum, rickets, sallowness,
   sclerosis, scurvy, seizure, shock, sickle-cell anemia, sickliness,
   sickly hue, skin eruption, sluggishness, sneezing, softness, sore,
   spasm, strengthlessness, struma, tabes, tachycardia, thalassemia,
   tumor, upset stomach, vascular hemophilia, vertigo,
   vitamin deficiency, vomiting, wanness, wasting, weakliness,
   weakness, weariness, xerophthalmia