: a white insoluble fibrous protein formed from fibrinogen by the action of thrombin especially in the clotting of blood
Examples of fibrin in a Sentence
Recent Examples on the Web
In more severe cases, injections such as corticosteroids, platelet-rich plasma (PRP) or fibrin may be necessary.
—
Sandra Rose Salathe, Flow Space, 29 Jan. 2025
The body accomplishes this by tightening the blood vessels (vasoconstriction), moving platelets to the injury site (platelet aggregation), and forming fibrin—a protein that helps blood clot.
—Michael Menna, Verywell Health, 17 Jan. 2025
These drugs slow down clotting by reducing fibrin formation and preventing clots from forming and growing.
—Anna Giorgi, Verywell Health, 1 Dec. 2024
The types of products that FDA regulates in this category… [do not include] blood taken from an individual and given back to the same individual as platelet rich fibrin...
—Kara Nesvig, Allure, 15 Aug. 2024
This is filled with fibers made of natural proteins like collagen and fibrin, which are part of the extracellular matrix that gives animal cells their structure.
—Breanna Draxler, Discover Magazine, 2 Apr. 2013
Blood clots form when fibrin, strands of protein that form a net in the blood vessels, begin to gather, causing platelets and cells to clump and get caught in the net.
—Sara Novak, Discover Magazine, 23 Mar. 2023
An epidermal sheet grown on a fibrin base, like the grafts used to heal a boy's skin in Germany.
—Nathaniel Scharping, Discover Magazine, 8 Nov. 2017
This plaque is made up of cholesterol, fatty substances, cellular waste products, calcium and fibrin, a clotting agent in the blood.
—Kristen Rogers, CNN, 17 Feb. 2023
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.
Sandra Rose Salathe, Flow Space, 29 Jan. 2025
The body accomplishes this by tightening the blood vessels (vasoconstriction), moving platelets to the injury site (platelet aggregation), and forming fibrin—a protein that helps blood clot.
—Michael Menna, Verywell Health, 17 Jan. 2025
These drugs slow down clotting by reducing fibrin formation and preventing clots from forming and growing.
—Anna Giorgi, Verywell Health, 1 Dec. 2024
The types of products that FDA regulates in this category… [do not include] blood taken from an individual and given back to the same individual as platelet rich fibrin...
—Kara Nesvig, Allure, 15 Aug. 2024
This is filled with fibers made of natural proteins like collagen and fibrin, which are part of the extracellular matrix that gives animal cells their structure.
—Breanna Draxler, Discover Magazine, 2 Apr. 2013
Blood clots form when fibrin, strands of protein that form a net in the blood vessels, begin to gather, causing platelets and cells to clump and get caught in the net.
—Sara Novak, Discover Magazine, 23 Mar. 2023
An epidermal sheet grown on a fibrin base, like the grafts used to heal a boy's skin in Germany.
—Nathaniel Scharping, Discover Magazine, 8 Nov. 2017
This plaque is made up of cholesterol, fatty substances, cellular waste products, calcium and fibrin, a clotting agent in the blood.
—Kristen Rogers, CNN, 17 Feb. 2023
Cite this Entry
“Fibrin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fibrin. Accessed 1 Mar. 2025.
Copy CitationKids Definition
fibrin
noun
fi·brin
ˈfī-brən 
: a white fibrous substance that is difficult to dissolve and is formed in the clotting of the blood
Medical Definition
fibrin
noun
fi·brin
ˈfī-brən
: a white insoluble fibrous protein formed from fibrinogen by the action of thrombin especially in the clotting of blood
Love words? Need even more definitions?
Merriam-Webster unabridged
Share