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Noun: cephalization  ,se-fu-lu'zey-shun [N. Amer], ,se-fu-lI'zey-shun [Brit]
  1. (biology) the evolutionary trend towards concentration of sensory and neural organs in the head of animals
    "Cephalization is evident in the complex brains of vertebrates";
    - cephalisation [Brit]

Derived forms: cephalizations

Encyclopedia: Cephalization