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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..

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.

Endothorax :: Endothorax (n.) An internal process of the sternal plates in the thorax of insects.

Thorax :: Thorax (n.) The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix..

Alitrunk :: Alitrunk (n.) The segment of the body of an insect to which the wings are attached; the thorax.

Episternum :: Episternum (n.) One of the lateral pieces next to the sternum in the thorax of insects.

Hydrothorax :: Hydrothorax (n.) An accumulation of serous fluid in the cavity of the chest.

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

Breast :: Breast (n.) Either one of the protuberant glands, situated on the front of the chest or thorax in the female of man and of some other mammalia, in which milk is secreted for the nourishment of the young; a mamma; a teat..

Apodeme :: Apodeme (n.) One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea..

Metathorax :: Metathorax (n.) The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

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

Pneumothorax :: Pneumothorax (n.) A condition in which air or other gas is present in the cavity of the chest; -- called also pneumatothorax.

Thorax :: Thorax (n.) The middle region of the body of an insect, or that region which bears the legs and wings. It is composed of three united somites, each of which is composed of several distinct parts. See Illust. in Appendix. and Illust. of Coleoptera..

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

Abdomen :: Abdomen (n.) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda..

Mediastinum :: Mediastinum (n.) A partition; a septum; specifically, the folds of the pleura (and the space included between them) which divide the thorax into a right and left cavity. The space included between these folds of the pleura, called the mediastinal space, contains the heart and gives passage to the esophagus and great blood vessels..

Echoscope :: Echoscope (n.) An instrument for intensifying sounds produced by percussion of the thorax.

Cephalothorax :: Cephalothorax (n.) The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax..

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

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