/ Dictionary / Index C chitosan: Meaning and Definition of Find definitions for: chi•to•san Pronunciation: (kī'tu-san"), [key] — n. Chem. a derivative of chitin, used in waste-water treatment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chiton Chi-tse Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language