• Webster's Revised Unabridged Dictionary
    • n Cephalothorax (Zoöl) The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax.
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Century Dictionary and Cyclopedia
    • n cephalothorax The anterior division of the body in arthropods, as crustaceans, spiders, scorpions, etc., consisting of the head and thorax blended together. The term is also applied to the entire anterior division of the body of members of the genus Limulus, by those who hold the view of its morphology thus implied.
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Webster's Revised Unabridged Dictionary
Cephalo-, + thorax,


In literature:

Philosophers have written volumes about my antennae and cephalothorax.
"Around The Tea-Table" by T. De Witt Talmage
The cephalothorax has stripes of brown and black, and the legs are barred with light and dark brown.
"A Book of Natural History" by Various
Instead the terms cephalothorax or prosoma are widely used.
"Explanation of Terms Used in Entomology" by John. B. Smith
Is the cephalothorax composed of segments?
"Elementary Zoology, Second Edition" by Vernon L. Kellogg