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Epichordal
Epichordal Ep`i*chor"dal, a. [Pref. epi- + chordal.] (Anat.)
Upon or above the notochord; -- applied esp. to a vertebral
column which develops upon the dorsal side of the notochord,
as distinguished from a perichordal column, which develops
around it.
Meaning of Epichordal from wikipedia