haematologyEnglishOxford Dictionary of Englishhaematology /ˌhiːməˈtɒlədʒi / (US English hematology) ▸ noun [mass noun] the branch of medicine involving study and treatment of the blood. – DERIVATIVES haematologic /ˌhiːmətəˈlɒdʒɪk / (US English hematologic) adjective haematological /ˌhiːmətəˈlɒdʒɪk(ə)l / (US English hematological) adjective haematologist /ˌhiːməˈtɒlədʒɪst / (US English hematologist) noun