notochord ( synonym found)
Definition of notochord:

(n) : a flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine; a similar structure found in the embryos of vertebrates from which the spine develops
Definition of notochord:

(n) : a flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine; a similar structure found in the embryos of vertebrates from which the spine develops
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