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Noun: cephalothorax (cephalothoraces,cephalothoraxes)  ,se-fu-low'tho,raks
  1. (zoology) the fused head and thorax of some arthropods, such as spiders and crustaceans
    "The cephalothorax of a crab houses most of its vital organs"

Derived forms: cephalothoraces, cephalothoraxes

Encyclopedia: Cephalothorax