Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A diffuse network of cells that conducts impulses in all directions from the area stimulated, forming a primitive nervous system in ctenophores, coelenterates, and certain other organisms.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Simplistic and uncentralized nervous system of cnidarians.

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