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Definition of: cephalothorax
(sef′ə·lō·thôr′aks, -thō′raks) noun Zool.
The anterior portion of certain arthropods, as crustaceans and arachnids, consisting of the united head and thorax.
—ceph′a·lo·tho·rac′ic (-thə·ras′ik) adjective
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