Definition of "cephalothorax" []

• The anterior section of arachnids and many crustaceans, consisting of the fused head and thorax. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It has an abdomen and what we call a cephalothorax, which is kind of a fusion of the head and the thorax region."
• "Instead the terms cephalothorax or prosoma are widely used.}: that portion of an obtect pupa covering head and thorax: the anterior segments of larva that have no obviously separated head."
• "Then they have a sternum which is located on the bottom of the cephalothorax, which is the flat structure that is surrounded by the legs."