A scientist or medical doctor who specializes in the study of blood and blood diseases; a hematologist.
From hemo- (blood) + -logist (Greek -logos, study). This term is an older variant of hematologist, using the Greek hemo- prefix instead of the Latin-derived haemato-, emerging in early 20th-century medical terminology.
Hemologist is basically the older, slightly shorter cousin of hematologist—both terms are used, but hematologist won out in modern medicine, probably because it sounds more authoritative at medical conferences.
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