pro·tho·rax

[proh-thawr-aks, -thohr-]
noun, plural pro·tho·rax·es, pro·tho·ra·ces [-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

pro·tho·rac·ic [proh-thaw-ras-ik, -thoh-] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
prothorax (prəʊˈθɔːræks) [Click for IPA pronunciation guide]
 
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Prothorax is always a great word to know.
So is flibbertigibbet. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.
Example sentences
The prothorax is enlarged, with the mesothorax and metathorax more narrow.
It is important to mention that the flea beetle prothorax lacks visible pleura.
Their head is mostly retracted into the prothorax with only the dark brown
  mouthparts visible.
It is a long-horned beetle and has two prominent bumps on the prothorax.
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