1) Haematologist 2) Medical specialist 3) Specialist 1) Haematologist 
A doctor who specializes in treating blood disorders.
(he″mә-tol´ә-jist) a specialist in hematology.
A doctor who specializes in the diseases of the blood.
Type: Term Pronunciation: hē′mă-tol′ŏ-jist, hem-ă- Definitions: 1. A physician trained and experienced in hematology, skilled in performing diagnostic examinations of blood and bone marrow, or in treatment of such diseases, or both.
Hematologist: A physician who is specially trained in the diagnosis, treatment, and prevention of diseases of the blood and bone marrow as well as the immunologic, hemostatic (blood clotting) and vascular systems. Because of the nature of blood, the science of hematology profoundly affects the understanding of many diseases.
[n] - a doctor who specializes in diseases of the blood and blood-forming organs
hematologist A physician who specializes in diseases of the blood.
a scientist who studies blood
a physician who specializes in the functions and disorders of the blood.