The Collaborative International Dictionary of English v.0.48:

Leuchaemia \Leu*ch[ae]"mi*a\ (l[-u]*k[=e]"m[i^]*[.a]), n. [NL.,
   fr. Gr. leyko`s white + a"i^ma blood.] (Med.)
   See Leukemia. [Written also leukemia, leukaemia,a nd
   leucemia.]
   -- Leu*ch[ae]m"ic (l[-u]*k[e^]m"[i^]k), a. [Written also
   leukemic and leukaemic.]
   [1913 Webster] Leucic

The Collaborative International Dictionary of English v.0.48:

leukaemia \leu*k[ae]"mi*a\ (l[-u]*k[=e]"m[i^]*[.a]), n.
   A disease in which the white corpuscles of the blood are
   largely increased in number, and there is enlargement of the
   spleen, or the lymphatic glands; formerly called
   leucocythaemia. It is due to a cancer of the bone marrow,
   and results in anemia and increased susceptibility to
   infectious disease. [Also spelled leucemia and
   leuchaemia.]
   [1913 Webster +PJC] Leuke

WordNet (r) 3.0 (2006):

leukaemia
    n 1: malignant neoplasm of blood-forming tissues; characterized
         by abnormal proliferation of leukocytes; one of the four
         major types of cancer [syn: leukemia, leukaemia,
         leucaemia, cancer of the blood]