[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.

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

prothoracic [proh-thaw-ras-ik, -thoh-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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