he·​ma·​tol·​o·​gy ˌhē-mə-ˈtä-lə-jē How to pronounce hematology (audio)
: a medical science that deals with the blood and blood-forming organs
hematologist noun

Did you know?

Blood is basic to almost all the body's functions, and a blood test can reveal more about your physical condition than almost any other kind of examination, so hematology is an important medical specialty, with many separate subjects. Since blood cells are formed in the bone marrow, the bones are one important focus for hematologists. The coagulation, or thickening, of the blood is another important subject, since coagulation is what keeps us from bleeding to death from even small wounds. And there are dozens of serious blood diseases, including anemia (a lack of red blood cells) and leukemia (cancer involving a buildup of white blood cells).

Example Sentences

Recent Examples on the Web The patient saw the hematology team in its office several weeks later. Lisa Sanders, M.d., New York Times, 16 May 2023 Prince was the first African-American to hold undergraduate and graduate degrees in clinical laboratory medicine with a specialty in flow cytometry and hematology and a doctorate in medical science education from UWM, according to the governor's office. Kelly Meyerhofer, Journal Sentinel, 7 Feb. 2023 Lack of physical activity, which is much more likely to happen in the wintertime during respiratory virus season, can lead to risk of forming blood clots, according to Dr. James Zehnder, attending physician of hematology service at Stanford Hospital. Sudiksha Kochi, USA TODAY, 14 Dec. 2021 Challenging the dogmas of hematology. Damian Garde And Angus Chen, STAT, 14 Dec. 2022 Systemic examination was not contributory, and routine hematology and urine examination were normal. Ncbi Rofl, Discover Magazine, 17 Nov. 2010 Once the drone landed, scientists conducted 19 chemistry and hematology tests on the blood. Lauren Sigfusson, Discover Magazine, 19 Sep. 2017 Elad Jacoby, a pediatric hematology and oncology physician at Sheba Medical Center, and colleagues knew that when isolated mitochondria are mixed with cells, the organelles slip into the cells and start working. Bymitch Leslie, science.org, 21 Dec. 2022 From 1969 to 1972, O’Leary fulfilled his military service by heading the blood coagulation unit in the hematology laboratory at the Walter Reed Army Institute of Research. Sam Roberts, BostonGlobe.com, 11 Feb. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hematology.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

circa 1811, in the meaning defined above

Time Traveler
The first known use of hematology was circa 1811

Dictionary Entries Near hematology

Cite this Entry

“Hematology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hematology. Accessed 27 May. 2023.

Medical Definition


variants or chiefly British haematology
plural hematologies
: a medical science that deals with the blood and blood-forming organs
hematologist noun
or chiefly British haematologist

More from Merriam-Webster on hematology

Last Updated: - Updated example sentences
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