Etymology
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notochord (n.)

"the primitive backbone," 1848, coined in English by English anatomist Sir Richard Owen from chord (n.2) + Greek nōton "back," which is perhaps from the same PIE source as Latin natis "buttock," which is the source of Italian and Spanish nalga, Old French nache "buttock, butt." Related: Notochordal.

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Definitions of notochord

notochord (n.)
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;
From wordnet.princeton.edu