/ Dictionary / Index P peptidase: Meaning and Definition of Find definitions for: pep•ti•dase Pronunciation: (pep'ti-dās", -dāz"), [key] — n. Biochem. any of the class of enzymes that catalyze the hydrolysis of peptides or peptones to amino acids. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: peptidase (Thesaurus) peptic ulcer peptide Related Content Daily Word Quiz: banshee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language