WordNet (r) 3.0 (2006):

achromasia
    n 1: unnatural lack of color in the skin (as from bruising or
         sickness or emotional distress) [syn: lividness,
         lividity, luridness, paleness, pallidness,
         pallor, wanness, achromasia]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "achromasia":
   achroma, achromatosis, albescence, albinism, albino, albinoism,
   blondness, canescence, chalkiness, creaminess, fairness,
   frostiness, glaucescence, glaucousness, grizzliness, hoariness,
   lactescence, leukoderma, lightness, milkiness, paleness,
   pearliness, silver, silveriness, snowiness, vitiligo, white,
   white race, whiteness, whitishness