The Collaborative International Dictionary of English v.0.48:
Hematology \Hem`a*tol"o*gy\, n. [Hemato- + -logy.] The science which treats of the blood. [1913 Webster]WordNet (r) 3.0 (2006):
hematology n 1: the branch of medicine that deals with diseases of the blood and blood-forming organs [syn: hematology, haematology]