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Noun: cephalization  ,se-fu-lu'zey-shun [N. Amer], ,se-fu-lI'zey-shun [Brit]
  1. Domination of the head in animal life as expressed in the physical structure; localization of important organs or parts in or near the head, in animal development
    - cephalisation [Brit]

Derived forms: cephalizations

Encyclopedia: Cephalization