/ Dictionary / Index U urease: Meaning and Definition of Find definitions for: u•re•ase Pronunciation: (yoor'ē-ās", -āz"), [key] — n. Biochem. an enzyme that changes urea into ammonium carbonate, occurring in bacteria, fungi, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: urease (Thesaurus) urea-formaldehyde resin uredinium Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language