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

The process of becoming chitinous.

Having the nature of chitin; consisting of, or containing, chitin.

A glucoside extracted from the leaves of a certain plant (Urechitis suberecta) as a bitter white crystalline substance.

See Chitin.

A chitinous structure above the nervous cord in the thorax of certain Crustacea.

See Chitin.

A stomach armed with chitinous or shelly plates or teeth, as in certain insects and mollusks. Gizzard shad (Zoöl.), an American herring (Dorosoma cepedianum) resembling the shad, but of little value. -- To fret the gizzard, to harass; to vex one's self; to worry. [Low] Hudibras. -- To stick in one's gizzard, to be di…

A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth.

he genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata.

An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates.

One of the chitinous supports, or veins, in the wings of incests.

Covered with a hard chitinous case, as the pupa of certain files.

One of the cells which secrete the chitinous teeth of Mollusca.

ollusks, except bivalves. It consists of several muscles and a cartilage which supports a chitinous radula, or lingual ribbon, armed with teeth. Also applied to the radula alone. See Radula.

A chitinous piece between the metasternum and the pleuron of certain insects.

A chitinous membrane covering the exterior of many shells; -- called also epidermis.

A chitinous structure which supports the gill in some invertebrates.

An internal dorsal chitinous process between the first two divisions of the thorax of insects.

any Diptera. -- Masked pupa, a pupa whose limbs are bound down and partly concealed by a chitinous covering, as in Lepidoptera.