histamine
noun
his·ta·mine
ˈhi-stə-ˌmēn 
-mən
-mən
: a compound C5H9N3 especially of mammalian tissues that causes dilation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion, that is released during allergic reactions, and that is formed by decarboxylation of histidine
Examples of histamine in a Sentence
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Some next-level treatments include over-the-counter or prescription medications, such as antacids, foaming agents, histamine (H2) blockers or protein pump inhibitors.
—
Hannah Yasharoff, USA Today, 19 Apr. 2025
When the immunoglobulin attacks the allergen, your body releases histamine, a chemical critical to inflammation (which, again, is really important when you are actually exposed to a dangerous parasite or virus).
—Dylan Scott, Vox, 15 Apr. 2025
The release of histamine, and other chemical mediators released by the mast cell, can lead to inflammation in the body, Bassett said.
—John W. Dean, MSNBC Newsweek, 6 Apr. 2025
The immediate rashes or hives appear due to the release of histamine.
—Femi Aremu, Verywell Health, 4 Apr. 2025
See All Example Sentences for histamine
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Hannah Yasharoff, USA Today, 19 Apr. 2025
When the immunoglobulin attacks the allergen, your body releases histamine, a chemical critical to inflammation (which, again, is really important when you are actually exposed to a dangerous parasite or virus).
—Dylan Scott, Vox, 15 Apr. 2025
The release of histamine, and other chemical mediators released by the mast cell, can lead to inflammation in the body, Bassett said.
—John W. Dean, MSNBC Newsweek, 6 Apr. 2025
The immediate rashes or hives appear due to the release of histamine.
—Femi Aremu, Verywell Health, 4 Apr. 2025
See All Example Sentences for histamine
Cite this Entry
“Histamine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/histamine. Accessed 30 Apr. 2025.
Copy CitationKids Definition
histamine
noun
his·ta·mine
ˈhis-tə-ˌmēn
-mən
: a compound that occurs in many animal tissues and plays an important part in allergic reactions (as in hives, asthma, and hay fever)
Medical Definition
histamine
noun
his·ta·mine
ˈhis-tə-ˌmēn
-mən
-mən
: a compound C5H9N3 especially of mammalian tissues that causes dilatation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion, that is released during allergic reactions, and that is formed by decarboxylation of histidine
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