Origin: Greek suffix -ology
Hematology has 2 different meanings across 1 category:
the branch of medicine that deals with diseases of the blood and blood-forming organs
"After receiving his abnormal lab results, Dr. Lin referred me to a specialist in hematology for further testing on my white blood cell count."
The scientific study of blood and blood-producing organs.
"After his routine checkup, Dr. Smith referred me to a specialist in hematology because my blood tests showed some unusual results."