/ Dictionary / Index C cathepsin: Meaning and Definition of Find definitions for: ca•thep•sin Pronunciation: (ku-thep'sin), [key] — n. Biochem. any of a class of intracellular proteolytic enzymes, occurring in animal tissue, esp. the liver, spleen, kidneys, and intestine, that catalyze autolysis in certain pathological conditions and after death. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cathedral hull Cather Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language