notochord


no·to·chord

noun \ˈnō-tə-ˌkrd\

Definition of NOTOCHORD

:  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
no·to·chord·al \ˌnō-tə-ˈkr-dəl\ adjective

Origin of NOTOCHORD

Greek nōton, nōtos back + Latin chorda cord — more at cord
First Known Use: 1848

no·to·chord

noun \ˈnōt-ə-ˌk(ə)rd\   (Medical Dictionary)

Medical Definition of NOTOCHORD

: 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, that is almost obliterated in the adult of the higher vertebrates as the bodies of the vertebrae develop, and that arises as an outgrowth from the dorsal lip of the blastopore extending forward between epiblast and hypoblast in the middorsal line
no·to·chord·al \ˌnōt-ə-ˈkrd-əl\ adjective

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