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Horn :: Horn (n.) Any natural projection or excrescence from an animal, resembling or thought to resemble a horn in substance or form; esp.: (a) A projection from the beak of a bird, as in the hornbill. (b) A tuft of feathers on the head of a bird, as in the horned owl. (c) A hornlike projection from the head or thorax of an insect, or the head of a reptile, or fish. (d) A sharp spine in front of the fins of a fish, as in the horned pout..

Mesonotum :: Mesonotum (n.) The dorsal portion of the mesothorax of insects.

Arthrostraca :: Arthrostraca (n. pl.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda..

Haematothorax :: Haematothorax (n.) Same as Hemothorax.

Prothorax :: Prothorax (n.) The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

Entothorax :: Entothorax (n.) See Endothorax.

Thorax :: Thorax (n.) A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks..

Pneumatothorax :: Pneumatothorax (n.) See Pneumothorax.

Elater :: Elater (n.) Any beetle of the family Elateridae, having the habit, when laid on the back, of giving a sudden upward spring, by a quick movement of the articulation between the abdomen and thorax; -- called also click beetle, spring beetle, and snapping beetle..

Baenomere :: Baenomere (n.) One of the somites (arthromeres) that make up the thorax of Arthropods.

Disjunct :: Disjunct (a.) Having the head, thorax, and abdomen separated by a deep constriction..

Pleural :: Pleural (a.) Of or pertaining to the pleura or pleurae, or to the sides of the thorax..

Spiracle :: Spiracle (n.) One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera..

Propodium :: Propodium (n.) The segment which forms the posterior part of the thorax of a hymenopterous insect.

Truncus :: Truncus (n.) The thorax of an insect. See Trunk, n., 5..

Scutum :: Scutum (n.) The second and largest of the four parts forming the upper surface of a thoracic segment of an insect. It is preceded by the prescutum and followed by the scutellum. See the Illust. under Thorax.

Abdomen :: Abdomen (n.) The belly, or that part of the body between the thorax and the pelvis. Also, the cavity of the belly, which is lined by the peritoneum, and contains the stomach, bowels, and other viscera. In man, often restricted to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity..

Hemoothorax :: Hemoothorax (n.) An effusion of blood into the cavity of the pleura.

Prosternum :: Prosternum (n.) The ventral plate of the prothorax of an insect.

Corselet :: Corselet (n.) The thorax of an insect.

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