/ Dictionary / Index F fibrinolysin: Meaning and Definition of Find definitions for: fi•bri•nol•y•sin Pronunciation: (fī"bru-nol'u-sin), [key] — n. Biochem. a proteolytic enzyme, formed in the blood from plasminogen, that causes the breakdown of the fibrin in blood clots. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fibrinolysin (Thesaurus) fibrinoid fibrinolysis Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language