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[proh-thawr-aks, -thohr-] /proʊˈθɔr æks, -ˈθoʊr-/
noun, plural prothoraxes, prothoraces
[proh-thawr-uh-seez, -thohr-] /proʊˈθɔr əˌsiz, -ˈθoʊr-/ (Show IPA)
the anterior division of the thorax of an insect, bearing the first pair of legs.
Origin of prothorax
1820-30; < New Latin; see pro-1, thorax
Related forms
[proh-thaw-ras-ik, -thoh-] /ˌproʊ θɔˈræs ɪk, -θoʊ-/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for prothorax
  • 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.
  • It is a long-horned beetle and has two prominent bumps on the prothorax.
British Dictionary definitions for prothorax


noun (pl) -thoraxes, -thoraces (-ˈθɔːrəˌsiːz)
the first segment of the thorax of an insect, which bears the first pair of walking legs See also mesothorax, metathorax
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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