notochord

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 (synset 101469113)
    is a type of: back, backbone, rachis, spinal column, spine, vertebral column - the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
    subtypes: urochord - a notochord of a larval tunicate typically confined to the caudal region

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