/ Dictionary / Index P proteinase: Meaning and Definition of Find definitions for: pro•tein•ase Pronunciation: (prō'tē-nās", -nāz", -tē-i-), [key] — n. Biochem. any of a group of enzymes that are capable of hydrolyzing proteins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: proteinase (Thesaurus) protein protein coat Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language