From ZooTerms (Dictionary of Invertebrate Zoology)
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cephalothorax (noun; Greek kephale, head; thorax, chest): (Arthropoda) A descriptive term used for many arthropods indicating the anterior region of the body combining head and thorax; sometimes used to denote fusion with one or more of the thoracic segments, as in crustaceans and coccids; for arachnids, see prosoma.