Webster's English Dictionary

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notochord

no.to.chord \'no-t-*-.ko.(*)rd\ \.no-t-*-'ko.rd-*l\ n [not- + L chorda cord 
   - more at CORD] : a longitudinal flexible rod of cells that in the lowest 
   chordates (as am phioxus and lampreys) and in the embryos of the higher 
   vertebrates forms the supporting axis of the body - no.to.chord.al aj