chitin

Noun
  1. A tough semitransparent horny substance;
    The principal component of the exoskeletons of arthropods and the cell walls of certain fungi (synset 114756901)
    is a type of: polyose, polysaccharide - any of a class of carbohydrates whose molecules contain chains of monosaccharide molecules
    substance holonym: glucosamine - an amino derivative of glucose that is a component of many polysaccharides

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