THORAX

thorax

(noun) part of an insect’s body that bears the wings and legs

thorax, chest, pectus

(noun) the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates

thorax

(noun) the middle region of the body of an arthropod between the head and the abdomen

Source: WordNet® 3.1

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Etymology

Noun

thorax (plural thoraces or thoraxes)

(anatomy) The region of the mammalian body between the neck and abdomen as well as the cavity containing the heart and lungs.

(entomology and arachnology) The middle of three distinct divisions in an insect, crustacean or arachnid body to which the legs are attached.

Source: Wiktionary

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Tho"rax, n. Etym: [L., fr. Gr.

1. (Anat.)

Definition: 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 vertebræ, the ribs, and the sternum, and which the heart and lungs are situated; the chest.

Note: In mammals the thoracic cavity is completely separated from the abdominal by the diaphragm, but in birds and many reptiles the separation is incomplete, while in other reptiles, and in amphibians and fishes, there is no marked separation and no true thorax.

2. (Zoöl.) (a) 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. (b) 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.

3. (Antiq.)

Definition: A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.

Source: Webster’s Unabridged Dictionary 1913 Edition

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