The Collaborative International Dictionary of English v.0.48:

Haematology \H[ae]m`a*tol"o*gy\ (h[e^]m`[.a]*t[o^]l"[-o]*j[y^]
   or h[=e]`m[.a]-), n.
   The science which treats of the blood. Same as Hematology.
   [1913 Webster]

WordNet (r) 3.0 (2006):

haematology
    n 1: the branch of medicine that deals with diseases of the
         blood and blood-forming organs [syn: hematology,
         haematology]