/ Dictionary / Index A apyrase: Meaning and Definition of Find definitions for: ap•y•rase Pronunciation: (ap'u-rās", -rāz"), [key] — n. Biochem. a relatively nonspecific ATPase occurring in plants and molds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. apx. apyretic Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language