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A flexible rodlike structure that is present in the embryos of all chordates and in the adult forms of certain groups, such as the lancelets and hagfishes. The notochord develops into the spinal column in most vertebrates.
[Greek nōton, back + chord.]
(Zoology) a fibrous longitudinal rod in all embryo and some adult chordate animals, immediately above the gut, that supports the body. It is replaced in adult vertebrates by the vertebral column
a long, flexible, rod-shaped structure that supports the vertical axis of the body in chordates and vertebrate embryos, in the latter developing into the spinal column.
[1840–50; < Greek nôt(on) the back + Greek chordḗ cord]
A flexible rod-like structure that forms the main support of the body in the embryos of vertebrate animals, later developing into a true backbone. Primitive relatives of the vertebrates, known as lancelets and tunicates, only have a notochord and never develop a backbone. Animals having a notochord during some stage of their development are called chordates.
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|Noun||1.||notochord - 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|
urochord - a notochord of a larval tunicate typically confined to the caudal region
n. notocordio, sostén fibrocelular del embrión que se convierte más tarde en la columna vertebral.