Webster's English Dictionary

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thorax

tho.rax \'tho-(*)r-.aks, 'tho.(*)r-\ \th*-'ra--.se-z, tho.-; 
   'tho-r-*-.se-z, 'tho.r-\ n or tho.rax.es or tho.ra.ces [ME, fr. L thorac-, 
   thorax breastplate, thorax, fr. Gk tho-ra] pl k-, tho-rax 1: the part of 
   the body of man and other mammals between the neck and the a bdomen; also : 
   its cavity in which the heart and lungs lie 2: the middle of the three 
   chief divisions of the body of an insect