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Endophragma :: Endophragma (n.) A chitinous structure above the nervous cord in the thorax of certain Crustacea.

Wing :: Wing (n.) One of the two pairs of upper thoracic appendages of most hexapod insects. They are broad, fanlike organs formed of a double membrane and strengthened by chitinous veins or nervures..

Elytrin :: Elytrin (n.) See Chitin.

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

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

Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

Parapleura :: Parapleura (n.) A chitinous piece between the metasternum and the pleuron of certain insects.

Nervure :: Nervure (n.) One of the chitinous supports, or veins, in the wings of incests..

Periostracum :: Periostracum (n.) A chitinous membrane covering the exterior of many shells; -- called also epidermis.

Tooth :: Tooth (n.) Any hard calcareous or chitinous organ found in the mouth of various invertebrates and used in feeding or procuring food; as, the teeth of a mollusk or a starfish..

Urechitoxin :: Urechitoxin (n.) A poisonous glucoside found accompanying urechitin, and extracted as a bitter white crystalline substance..

Odontophore :: Odontophore (n.) A special structure found in the mouth of most mollusks, 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..

Seaboat :: Seaboat () A chitin.

Odontoblast :: Odontoblast (n.) One of the cells which secrete the chitinous teeth of Mollusca.

Seta :: Seta (n.) One of the movable chitinous spines or hooks of an annelid. They usually arise in clusters from muscular capsules, and are used in locomotion and for defense. They are very diverse in form..

Radula :: Radula (n.) The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore..

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the 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..

Prophragma :: Prophragma (n.) An internal dorsal chitinous process between the first two divisions of the thorax of insects.

Trematodea :: Trematodea (n. pl.) An extensive order of parasitic worms. They are found in the internal cavities of animals belonging to all classes. Many species are found, also, on the gills and skin of fishes. A few species are parasitic on man, and some, of which the fluke is the most important, are injurious parasites of domestic animals. The trematodes usually have a flattened body covered with a chitinous skin, and are furnished with two or more suckers for adhesion. Most of the species are hermaphrodi

Hypoderma :: Hypoderma (n.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates..

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