Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The part of the human body between the neck and the diaphragm, partially encased by the ribs and containing the heart and lungs; the chest.
  • n. A part in other vertebrates that corresponds to the human thorax.
  • n. The second or middle region of the body of an arthropod, between the head and the abdomen, in insects bearing the true legs and wings.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the middle of three distinct divisions in an insect, crustacean or arachnid body
  • n. the region of the mammalian body between the neck and abdomen as well as the cavity containing the heart and lungs

from the GNU version of the Collaborative International Dictionary of English

  • 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 vertebræ, the ribs, and the sternum, and which the heart and lungs are situated; the chest.
  • n.
  • 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.
  • 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.
  • n. A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.

from The Century Dictionary and Cyclopedia

  • n. In anatomy and zoology, a part of the trunk between the head or neck and the abdomen or tail, in any way distinguished, as by containing the heart and lungs, by being inclosed with large ribs, or by bearing certain limbs not borne elsewhere.
  • n. In entomology, that part of the body which is situated between the head and the abdomen, and in adult insects alone bears the wings and legs, when there are any. ;
  • n. In Crustacea and Arachnida, a part of the body in advance of and in any way distinguished from the abdomen or tail, but usually blended with the head to form a cephalothorax.
  • n. A breastplate, cuirass, or corselet; more especially, the cuirass or corselet worn by the ancient Greek warriors, corresponding to the lorica of the Romans.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates
  • n. part of an insect's body that bears the wings and legs
  • n. the middle region of the body of an arthropod between the head and the abdomen

Etymologies

Middle English, from Latin thōrāx, breastplate, chest, from Greek.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek θώραξ (thōraks, "a breastplate, cuirass, corslet") (Wiktionary)

Examples

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