Notochord
WordNet

noun


(1)   A flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates
WiktionaryText

Noun



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