/ Dictionary / Index P proteolysis: Meaning and Definition of Find definitions for: pro•te•ol•y•sis Pronunciation: (prō"tē-ol'u-sis), [key] — n. Biochem. the breaking down of proteins into simpler compounds, as in digestion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: proteolysis (Thesaurus) proteoglycan proteose Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language