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chitin

noun [U]
 
 
/ˈkaɪ.tɪn/ US  /-tən/ specialized

Definition

a hard substance in the outer shell of insects and animals such as shrimp and lobster, and in the cell walls of some fungiFruits and seeds and their partsThe skin, hair and bone of non-human animals
(Definition of chitin noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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