notochord

  1. Noun.  A flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine.
  2. Noun.  A similar structure found in the embryos of vertebrates from which the spine develops.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.