/ Dictionary / Index A arginase: Meaning and Definition of Find definitions for: ar•gi•nase Pronunciation: (är'ju-nās", -nāz"), [key] — n. Biochem. a liver enzyme that converts arginine to urea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. argillite arginine Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language