[sef-uh-loh-thawr-aks, -thohr-]
noun, plural cephalothoraxes, cephalothoraces [sef-uh-loh-thawr-uh-seez, -thohr-] . Zoology.
the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.

1825–35; cephalo- + thorax

cephalothoracic [sef-uh-loh-thuh-ras-ik] , adjective
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World English Dictionary
cephalothorax (ˌsɛfələʊˈθɔːræks)
n , pl -raxes, -races
the anterior part of many crustaceans and some other arthropods consisting of a united head and thorax

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1835, from Gk. kephale "head" + thorax.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
cephalothorax   (sěf'ə-lə-thôr'āks')  Pronunciation Key 
The combined head and thorax of arachnids, such as spiders, and of many crustaceans, such as crabs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Her cephalothorax lowers, he dances with the rising sun as if beckoning the
  light to share in this moment.
The abdomen is equal in length or a little longer than the cephalothorax.
Pupae do not have a distinct head and thorax, rather a composite structure
  called the cephalothorax.
They have five to seven pairs of legs, two pairs of antennae, and two body
  regions know as the cephalothorax and abdomen.
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