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prothorax

[proh-thawr-aks, -thohr-]
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noun, plural pro·tho·rax·es, pro·tho·ra·ces [proh-thawr-uh-seez, -thohr-] /proʊˈθɔr əˌsiz, -ˈθoʊr-/.
  1. the anterior division of the thorax of an insect, bearing the first pair of legs.
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Origin of prothorax

From New Latin, dating back to 1820–30; see origin at pro-1, thorax
Related formspro·tho·rac·ic [proh-thaw-ras-ik, -thoh-] /ˌproʊ θɔˈræs ɪk, -θoʊ-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for prothorax

prothorax

noun plural -thoraxes or -thoraces (-ˈθɔːrəˌsiːz)
  1. the first segment of the thorax of an insect, which bears the first pair of walking legsSee also mesothorax, metathorax
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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