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thorax
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- Thorax - n. - The part of the trunk between the neck and the abdomen, containing that part of the body cavity the walls of which are supported by the dorsal vertebrae, the ribs, and the sternum, and which the heart and lungs are situated; the chest.
- 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.
- 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.
- Thorax - n. - A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.
- Thoracic - n. - One of a group of fishes having the ventral fins placed beneath the thorax or beneath the pectorial fins.
- Truncus - n. - The thorax of an insect. See Trunk, n., 5.
- 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.
- Episternum - n. - One of the lateral pieces next to the sternum in the thorax of insects.
- Corselet - n. - The thorax of an insect.
- Prosoma - n. - The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod.
- Baenosome - n. - The thorax of Arthropods.
- Manitrunk - n. - The anterior segment of the thorax in insects. See Insect.
- 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.
- 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.
- Prophragma - n. - An internal dorsal chitinous process between the first two divisions of the thorax of insects.
- Endophragma - n. - A chitinous structure above the nervous cord in the thorax of certain Crustacea.
- Apodeme - n. - One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea.
- Pneumatograph - n. - An instrument for recording the movements of the thorax or chest wall during respiration; -- also called stethograph.
- Waist - n. - That part of the human body which is immediately below the ribs or thorax; the small part of the body between the thorax and hips.
- Metasternum - n. - The ventral plate of the third or last segment of the thorax of insects.
- Prothorax - n. - The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.
- Coarctate - a. - Pressed together; closely connected; -- applied to insects having the abdomen separated from the thorax only by a constriction.
- Mesothorax - n. - The middle segment of the thorax in insects. See Illust. of Coleoptera.
- 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.
- Metathorax - n. - The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.
- 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.
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