prothorax

[proh-thawr-aks, -thohr-]
noun, plural prothoraxes, prothoraces [proh-thawr-uh-seez, -thohr-] .
the anterior division of the thorax of an insect, bearing the first pair of legs.

Origin:
1820–30; < Neo-Latin; see pro-1, thorax

prothoracic [proh-thaw-ras-ik, -thoh-] , adjective
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World English Dictionary
prothorax (prəʊˈθɔːræks)
 
n , pl -thoraxes, -thoraces
mesothorax See also metathorax the first segment of the thorax of an insect, which bears the first pair of walking legs

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Example sentences
It is important to mention that the flea beetle prothorax lacks visible pleura.
The head is usually concealed from above by the prothorax.
Their head is mostly retracted into the prothorax with only the dark brown
  mouthparts visible.
The prothorax is enlarged, with the mesothorax and metathorax more narrow.
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