[fahy-brin] /ˈfaɪ brɪn/

the insoluble protein end product of blood coagulation, formed from fibrinogen by the action of thrombin in the presence of calcium ions.
Botany. a fibrinlike substance found in some plants; gluten.
a white insoluble elastic protein formed from fibrinogen when blood clots: forms a network that traps red cells and platelets

blood-clotting substance, 1800, from Latin fibra (see fiber) + chemical suffix -in (2). So called because it is deposited as a network of fibers that cause the blood to clot.

fibrin fi·brin (fī’brĭn)
An elastic, insoluble, whitish protein derived from fibrinogen by the action of thrombin and forming an interlacing fibrous network in the coagulation of blood.
fi’brin·ous adj.
A fibrous protein produced by the action of thrombin on fibrinogen and essential to the coagulation of blood. Fibrin works by forming a fibrous network in which blood cells become trapped, producing a clot.


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    fibrinase fi·brin·ase (fī’brə-nās’, -nāz’) n.

  • Fibrin calculus

    fibrin calculus n. A urinary calculus formed primarily from blood fibrinogen.

  • Fibrino-

    1. a combining form representing fibrin, in compound words: fibrinolysis. fibrino- pref. Fibrin: fibrinocellular.

  • Fibrinocellular

    fibrinocellular fi·bri·no·cel·lu·lar (fī’brə-nō-sěl’yə-lər) adj. Composed of fibrin and cells, as in certain exudates resulting from acute inflammation.

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