English definition of Thorax

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Definition of thorax

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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..

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Thorax :: 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..

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

Prothoracic :: Prothoracic (a.) Of or pertaining to the prothorax.

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

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

Semirecondite :: Semirecondite (a.) Half hidden or half covered; said of the head of an insect when half covered by the shield of the thorax.

Metasternum :: Metasternum (n.) The ventral plate of the third or last segment of the thorax of insects.

Baenosome :: Baenosome (n.) The thorax of Arthropods.

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

Post-abdomen :: Post-abdomen (n.) That part of a crustacean behind the cephalothorax; -- more commonly called abdomen.

Mesothorax :: Mesothorax (n.) The middle segment of the thorax in insects. See Illust. of Coleoptera.

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.

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

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

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

Coarctate :: Coarctate (a.) Pressed together; closely connected; -- applied to insects having the abdomen separated from the thorax only by a constriction.

Pleura :: Pleura (n. fem.) The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane.

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

Thoracoplasty :: Thoracoplasty (n.) A remodeling or reshaping of the thorax; especially, the operation of removing the ribs, so as to obliterate the pleural cavity in cases of empyema..

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..