: a granulocyte that occurs especially in connective tissue and has basophilic granules containing substances (such as histamine and heparin) which mediate allergic reactions
Examples of mast cell in a Sentence
Recent Examples on the Web
This injectable medication targets your immune system and prevents mast cell activation.
—
Zia Sherrell, Health, 17 Feb. 2026
Eye irritation: The same mast cells reside inside your eyes, as well, and can trigger eye itching, swelling, redness, and tearing.
—Rae Ford, Martha Stewart, 24 Jan. 2026
Stress also makes mast cells, which are the cells involved in allergies and hives, more sensitive, Dr. Wada explains.
—Korin Miller, SELF, 1 Dec. 2025
Next, Platts-Mills sent some of the blood to the Mayo Clinic lab, which tested it for an enzyme called tryptase that’s made by immune cells called mast cells.
—Brenda Goodman, CNN Money, 14 Nov. 2025
See All Example Sentences for mast cell
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Zia Sherrell, Health, 17 Feb. 2026
Eye irritation: The same mast cells reside inside your eyes, as well, and can trigger eye itching, swelling, redness, and tearing.
—Rae Ford, Martha Stewart, 24 Jan. 2026
Stress also makes mast cells, which are the cells involved in allergies and hives, more sensitive, Dr. Wada explains.
—Korin Miller, SELF, 1 Dec. 2025
Next, Platts-Mills sent some of the blood to the Mayo Clinic lab, which tested it for an enzyme called tryptase that’s made by immune cells called mast cells.
—Brenda Goodman, CNN Money, 14 Nov. 2025
See All Example Sentences for mast cell
Cite this Entry
“Mast cell.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mast%20cell. Accessed 19 Feb. 2026.
Copy CitationMedical Definition
mast cell
noun
: a granulocyte that occurs especially in connective tissue and has basophilic granules containing substances (as histamine and heparin) which mediate allergic reactions
Love words? Need even more definitions?
Merriam-Webster unabridged
