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[sef-uh-luh-zey-shuh n] /ˌsɛf ə ləˈzeɪ ʃən/
noun, Zoology
a tendency in the development of animals to localization of important organs or parts in or near the head.
1860-65; cephal- + -ization Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cephalization


(in the evolution of animals) development of a head by the concentration of feeding and sensory organs and nervous tissue at the anterior end
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for cephalization

1864, coined by U.S. zoologist James D. Dana (1813-1895) from Greek kephale "head" (see cephalo-) on model of specialization, etc.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for cephalization

the differentiation of the anterior (front) end of an organism into a definite head. Considered an evolutionary advance, cephalization is accompanied by a concentration of nervous tissue (cephalic ganglion or brain) in the head region that serves to integrate the activities of the nervous system. Some groups of organisms (e.g., Aschelminthes) show full cephalization, but because their bodies are not divided into distinct trunks and heads, they cannot be said to possess a distinct anatomical head

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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