from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An evolutionary trend in which the neural and sense organs become centralized at one end (the head) of an animal
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. In biology, a term first used by J. D. Dana to denote a tendency in the development of animals to localization of important parts in the neighborhood of the head, as by the transfer of locomotive members or limbs to or near to the head (in decapod crustaceans, for example), or the concentration of plastic force in parts composing the head, or subserving cephalic functions.
- n. A supposed tendency to a gradual increase in the size of the brain correlative with cultural development.
Sorry, no etymologies found.