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notochord 音標拼音: [n'otək,ɔrd] n. 脊索 脊索 notochord 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 Notochord \No"to*chord\, n. [Gr. nw^ton 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 vertebrae and the posterior part of the base of the skull are developed; the {chorda dorsalis}. See Illust. of {Ectoderm}. [1913 Webster]
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