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Meaning of cephalothorax

ceph•a•lo•tho•rax

Pronunciation: (sef"u-lō-thôr'aks, -thōr'-), [key]
— pl. -tho•rax•es, -tho•ra•ces
  1. the anterior part of the body in certain arachnids and crustaceans, consisting of the coalesced head and thorax.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.