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chitin

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definition: 
A fibrous substance consisting of polysaccharides, which is the major constituent in the exoskeleton of arthropods and the cell walls of fungi.
sentence: 
There are a few other animal carbohydrates, notably chitin, the substance which constitutes the hard outer casing of insects and crustaceans.
difficulty: 
hard
toefl frequency: 
1
toefl classification: