chitinPronunciation: /ˈkʌɪtɪn/Definition of chitin noun [mass noun] Biochemistry a fibrous substance consisting of polysaccharides, which is the major constituent in the exoskeleton of arthropods and the cell walls of fungi. Derivatives chitinous adjective Origin: mid 19th century: from French chitine, formed irregularly from Greek khitōn (see chiton)chitin in other Oxford dictionaries Definition of chitin in the US English dictionary
