eo·​sin·​o·​phil | \ ˌē-ə-ˈsi-nə-ˌfil How to pronounce eosinophil (audio) \

Definition of eosinophil

 (Entry 1 of 2)



Definition of eosinophil (Entry 2 of 2)

: a granulocyte readily stained by eosin that is present at sites of allergic reactions and parasitic infections

Examples of eosinophil in a Sentence

Recent Examples on the Web: Adjective Elevated eosinophils can also be seen in patients with asthma, and this patient had a history of asthma, but even then eosinophil counts are rarely this high. Lisa Sanders, New York Times, 16 May 2018 Recent Examples on the Web: Noun Acute eosinophilic pneumonia occurs when eosinophils, a type of white blood cell, rapidly accumulate in the lungs, according to the Genetic and Rare Diseases Information Center. Samantha Lauriello, Health.com, 3 Sep. 2019 Drugs, including aspirin and other NSAIDs — nonsteroidal anti-inflammatories including ibuprofen — can cause an increase in eosinophils for reasons that are not well understood. Sandra G. Boodman, Washington Post, 23 June 2018 Feng had recently completed his residency at Scripps Clinic in San Diego, during which he had been involved in the care of several dozen patients with a similar profile: recurrent sinus infections, asthma and high eosinophil counts. Sandra G. Boodman, Washington Post, 23 June 2018 The tiny samples were loaded with eosinophils, up to 100 of the cells per high-powered microscopic field. Lisa Sanders, New York Times, 16 May 2018 Elevated eosinophils can be seen in Crohn’s, although not usually as high as this young woman’s. Lisa Sanders, New York Times, 16 May 2018 Instead, their blood was swarming with another type of immune cell, eosinophils, which provoke allergic reactions. Gina Kolata, New York Times, 3 Aug. 2016 Physicians can now blend standard data like age, race, and medical history, along with molecular data like the composition and amount of a person’s eosinophils, a type of white blood cell that mediates asthma attacks. Vann R. Newkirk Ii, The Atlantic, 5 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'eosinophil.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of eosinophil


circa 1882, in the meaning defined above


circa 1900, in the meaning defined above

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The first known use of eosinophil was circa 1882

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Cite this Entry

“Eosinophil.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eosinophil. Accessed 27 Nov. 2021.

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More Definitions for eosinophil


eo·​sin·​o·​phil | \ ˌē-ə-ˈsin-ə-ˌfil How to pronounce eosinophil (audio) \
variants: also eosinophile \ -​ˌfīl How to pronounce eosinophil (audio) \

Medical Definition of eosinophil

 (Entry 1 of 2)


variants: also eosinophile

Medical Definition of eosinophil (Entry 2 of 2)

: a white blood cell or other granulocyte with cytoplasmic inclusions readily stained by eosin

More from Merriam-Webster on eosinophil

Britannica.com: Encyclopedia article about eosinophil


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