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cephalothorax

[sef-uh-loh-thawr-aks, -thohr-]

Origin

noun, plural ceph·a·lo·tho·rax·es, ceph·a·lo·tho·ra·ces

[-thawr-uh-seez, -thohr-] . Zoology.

the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.

Origin:
1825–35; cephalo- + thorax

Related forms

ceph·a·lo·tho·rac·ic

[sef-uh-loh-thuh-ras-ik] , adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cephalothorax is always a great word to know.

So is platyhelminthes. Does it mean:

phylum of worms with bilateral symmetry and soft, usually flattened bodies

phylum of worms comprised of parasitic and free-living nonparasitic species

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Collins

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

cephalothoracic

—*adj*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

cephalothorax

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.