Thorax Tho"rax, n. [L., fr. Gr. ?.] 1. (Anat.) 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 vertebr[ae], the ribs, and the sternum, and which the heart and lungs are situated; the chest. [1913 Webster]

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. [1913 Webster]

2. (Zo["o]l.) (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. [1913 Webster]

3. (Antiq.) A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

  • THORAX — Le thorax des Vertébrés représente la partie supérieure ou céphalique du tronc. Dans le cas des Vertébrés aériens, exception faite, néanmoins, du cas des Batraciens, il s’agit d’une cage osseuse largement fenêtrée dont les mouvements incessants… …   Encyclopédie Universelle

  • thorax — chest, c.1400, from L. thorax, from Gk. thorax (gen. thorakos) breastplate, chest, of unknown origin …   Etymology dictionary

  • thorax — [thôr′aks΄] n. pl. thoraxes or thoraces [thôr′ə sēz΄] [ME < L < Gr thōrax, chest, breastplate] 1. in tetrapods, including humans, a) the part of the body cavity from the neck or head to the abdomen, containing the heart, lungs, etc.; chest …   English World dictionary

  • Thorax — (gr.), 1) Panzer, s.d. 1); 2) Schnürbrust; 3) Brust, auch der ganze Brustkasten; daher Thoraxarterie, s. Achselarterie; Thoraxgegenden (Regiones thoracicae), Abtheilungen der äußeren Fläche des Brustkastens. Man unterscheidet vorn: die… …   Pierer's Universal-Lexikon

  • Thorax — (griech.), Brustpanzer (s. Rüstung); in der Anatomie die Brust der Wirbeltiere und Gliederfüßer. Bei den letztern ist der T. zuweilen mit dem Kopf zur Kopfbrust (Cephalothorax) verwachsen …   Meyers Großes Konversations-Lexikon

  • Thorax — (grch.), Brustharnisch; anatomisch der Brustkasten, bei Insekten das Bruststück (s.d.) …   Kleines Konversations-Lexikon

  • Thorax — Thorax, griech., Brustharnisch; Brustkasten; Thorakocystes, Brustwassersucht …   Herders Conversations-Lexikon

  • Thorax — Thorax, 1) bei Wirbeltieren der von den Rippen gebildete Brustkorb; 2) aus drei Segmenten bestehender, zwischen Kopf und Abdomen liegender, Beine und Flügel tragender Teil des Körpers der Arthropoden …   Deutsch wörterbuch der biologie

  • Thorax — Thorax,der:⇨Brust(I,1) …   Das Wörterbuch der Synonyme

  • thorax — ► NOUN (pl. thoraces or thoraxes) 1) Anatomy & Zoology the part of the body between the neck and the abdomen. 2) the middle section of the body of an insect, bearing the legs and wings. ORIGIN Greek …   English terms dictionary

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