1. chitin

noun. a tough semitransparent horny substance; the principal component of the exoskeletons of arthropods and the cell walls of certain fungi.


  • polysaccharide
  • glucosamine


  • chitine (French)
  • chiton (Latin)

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Sentences with chitin

1. Noun, singular or mass
Each of these pieces is shaped like a ring, and made from chitin that is thicker than anywhere else on the butterfly’s body.

2. Noun, plural
Crickets are high in protein but also contain chitin, which can cause digestive problems.