: 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
New Atlas, 13 Oct. 2025
The typical complete blood count panel includes an eosinophil count, so most people already have that information in their medical records.
—Claire Bugos, Verywell Health, 29 Apr. 2025
These findings suggest that Dupixent may be a good add-on therapy for people who have high eosinophil levels that suggest inflammation in their lungs and who don’t get enough symptom relief from COPD inhalers, says Hanania.
—Lisa Rapaport, EverydayHealth.com, 27 Sep. 2024
The research has also suggested a role for a certain type of vitamin D (gamma-tocopherol) that appears to calm the eosinophil response to pollution.
—Linda Carroll, TIME, 30 May 2024
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
New Atlas, 13 Oct. 2025
Struggles With a Rare Condition Parker lived with eosinophilic esophagitis (EoE), a chronic allergic condition where white blood cells called eosinophils build up in the esophagus.
—Lucy Notarantonio, MSNBC Newsweek, 5 Sep. 2025
Blood work showed the presence of eosinophils — a type of white blood cell that fights parasitic infections.
—Cara Lynn Shultz, People.com, 2 July 2025
One feature stood out: The man had developed elevated levels of eosinophils, white blood cells that can increase for various reasons—including parasitic infections.
—ArsTechnica, 20 June 2025
It is only approved for people with high levels of eosinophils, a type of immune cell that contributes to inflammation.
—Claire Bugos, Verywell Health, 29 Apr. 2025
Blood tests showed elevated eosinophils, which can be a sign of a parasitic infection, among other things.
—Ars Technica, 11 Mar. 2025
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Adjective
In addition to eosinophil counts, the researchers measured white blood cells, inflammation markers, pain intensity, complications and comorbidities (conditions such as asthma, migraine, fibromyalgia, and rheumatoid arthritis).
—New Atlas, 13 Oct. 2025
The typical complete blood count panel includes an eosinophil count, so most people already have that information in their medical records.
—Claire Bugos, Verywell Health, 29 Apr. 2025
These findings suggest that Dupixent may be a good add-on therapy for people who have high eosinophil levels that suggest inflammation in their lungs and who don’t get enough symptom relief from COPD inhalers, says Hanania.
—Lisa Rapaport, EverydayHealth.com, 27 Sep. 2024
The research has also suggested a role for a certain type of vitamin D (gamma-tocopherol) that appears to calm the eosinophil response to pollution.
—Linda Carroll, TIME, 30 May 2024
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
Noun
Patients with and without eosinophilia were compared, with eosinophilia defined as ≥350 eosinophils per microliter of blood – a mild threshold, slightly lower than the standard 500 eosinophils per microliter.
—New Atlas, 13 Oct. 2025
Struggles With a Rare Condition Parker lived with eosinophilic esophagitis (EoE), a chronic allergic condition where white blood cells called eosinophils build up in the esophagus.
—Lucy Notarantonio, MSNBC Newsweek, 5 Sep. 2025
Blood work showed the presence of eosinophils — a type of white blood cell that fights parasitic infections.
—Cara Lynn Shultz, People.com, 2 July 2025
One feature stood out: The man had developed elevated levels of eosinophils, white blood cells that can increase for various reasons—including parasitic infections.
—ArsTechnica, 20 June 2025
It is only approved for people with high levels of eosinophils, a type of immune cell that contributes to inflammation.
—Claire Bugos, Verywell Health, 29 Apr. 2025
Blood tests showed elevated eosinophils, which can be a sign of a parasitic infection, among other things.
—Ars Technica, 11 Mar. 2025
Cite this Entry
“Eosinophil.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eosinophil. Accessed 31 Oct. 2025.
Copy CitationMedical Definition
eosinophil
1 of 2 adjective
eo·sin·o·phil
ˌē-ə-ˈsin-ə-ˌfil 
variants
also eosinophile
eosinophil
2 of 2 noun
variants
also eosinophile
: a white blood cell or other granulocyte with cytoplasmic inclusions readily stained by eosin
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