Medical Definition of thorax
plural tho·rax·es or tho·ra·ces \ˈthōr-ə-ˌsēz, ˈthȯr-\play
1: the part of the mammalian body that is situated between the neck and the abdomen and supported by the ribs, costal cartilages, and sternum; also : thoracic cavity
2: the middle of the three chief divisions of the body of an insect; also : the corresponding part of a crustacean or an arachnid
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