Main Entry: tho·rax

Pronunciation: \ˈthȯr-ˌaks\

Function: noun

Inflected Form(s): plural tho·rax·es or tho·ra·ces \ˈthȯr-ə-ˌsēz\

Etymology: Middle English, from Latin thorac-, thorax breastplate, thorax, from Greek thōrak-, thōrax

Date: 15th century

1 : the part of the mammalian body between the neck and the abdomen; also : its cavity in which the heart and lungs lie
2 : the middle of the three chief divisions of the body of an insect; also : the corresponding part of a crustacean or an arachnid