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1. (n.) notochord
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.
Etymology: (1840–50; < Gk
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| Definition of 'notochord' |
Princeton's WordNet |
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1. (noun) 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
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| Definition of 'notochord' |
Webster Dictionary |
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1. (noun) notochord
an elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm
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| Definition of 'notochord' |
U.S. National Library of Medicine |
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1. notochord
A cartilaginous rod of mesodermal cells at the dorsal midline of all CHORDATE embryos. In lower vertebrates, notochord is the backbone of support. In the higher vertebrates, notochord is a transient structure, and segments of the vertebral column will develop around it. Notochord is also a source of midline signals that pattern surrounding tissues including the NEURAL TUBE development.
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Definitions of notochord 
