Hypertext Webster Gateway: "notochord"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
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
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