/ Dictionary / Index U urokinase: Meaning and Definition of Find definitions for: u•ro•ki•nase Pronunciation: (yoor"u-kī'nās, -nāz), [key] — n. Biochem., Pharm. an enzyme, present in the blood and urine of mammals, that activates plasminogen and is used medicinally to dissolve blood clots. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: urokinase (Thesaurus) urogenous urolith Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language