[ sef-uh-loh-thawr-aks, -thohr- ]
/ ˌsɛf ə loʊˈθɔr æks, -ˈθoʊr- /

noun, plural ceph·a·lo·tho·rax·es, ceph·a·lo·tho·ra·ces [sef-uh-loh-thawr-uh-seez, -thohr-] /ˌsɛf ə loʊˈθɔr əˌsiz, -ˈθoʊr-/. Zoology.

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

Origin of cephalothorax

First recorded in 1825–35; cephalo- + thorax

Related forms

ceph·a·lo·tho·rac·ic [sef-uh-loh-thuh-ras-ik] /ˌsɛf ə loʊ θəˈræs ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for cephalothoracic


/ (ˌsɛfələʊˈθɔːræks) /

noun plural -raxes or -races (-rəˌsiːz)

the anterior part of many crustaceans and some other arthropods consisting of a united head and thorax

Derived Forms

cephalothoracic (ˌsɛfələʊθəˈræsɪk), adjective
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

Medicine definitions for cephalothoracic


[ sĕf′ə-lō-thə-răsĭk ]


Relating to the head and the chest.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for cephalothoracic


[ sĕf′ə-lə-thôrăks′ ]

The combined head and thorax of arachnids, such as spiders, and of many crustaceans, such as crabs.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.