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[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.
Origin of fibrin
1790-1800; fibr- + -in2
Related forms
fibrinous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for fibrin


a white insoluble elastic protein formed from fibrinogen when blood clots: forms a network that traps red cells and platelets
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fibrin

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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fibrin in Medicine

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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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fibrin in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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