Chitin

['kaɪtɪn]

Definition

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

Checker: Raymond--From WordNet

Definition

(n.) A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; entomolin.

Checked by Blanchard

Definition

n. the substance which forms most of the hard parts of jointed footed animals.—adj. Chī′tinous.

Checked by Bernadette