a tough, horny polysaccharide, (CHNO), secreted by the epidermis and forming the main bulk of the outer covering of insects, crustaceans, etc.
Origin of chitinFrench chitine from Classical Greek chit?n: see chiton
A nitrogen-containing polysaccharide that is a tough, protective, semitransparent substance and is the principal component of arthropod exoskeletons and the cell walls of certain fungi.
Origin of chitinFrench chitine New Latin chitōn mollusk ( from Greek khitōn chiton ; see chiton . ) -ine 2