prochordal--prophetes.ai

prochordal, a. Embryol.
  (prəʊˈkɔːdəl)
  [f. pro-² + chord n.¹ + -al¹.]
  Anterior to the notochord.

1881 Academy 23 Apr. 303 The prochordal part of the trabeculae is segmented off from the parachordal part.

Oxford English Dictionary