hematologist

noun

he·​ma·​tol·​o·​gist ˌhēməˈtäləjə̇st 

ˌhem-

plural -s

: one that specializes in the study of blood

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Kids Definition

hematologist

noun

he·​ma·​tol·​o·​gist

ˌhē-mə-ˈtäl-ə-jəst

: a person who specializes in the study of blood and the blood-forming organs