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notochord definitions

WordNet (r) 3.0 (2005)

n
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

Merriam Webster's

noun Etymology: Greek n?ton, n?tos back + Latin chorda cord more at cord Date: 1848 a longitudinal flexible rod of cells that in the lowest chordates (as a lancelet or a lamprey) and in the embryos of the higher vertebrates forms the supporting axis of the body notochordal adjective

Oxford Reference Dictionary

n. a cartilaginous skeletal rod supporting the body in all embryo and some adult chordate animals. Etymology: Gk noton back + CHORD(2)

Webster's 1913 Dictionary

Notochord No"to*chord, n. [Gr. ? the back + E. chord.] (Anat.) 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 vertebr[ae] and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.



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