Procœlian /(?)/

Pro·cœ·li·an

Procœlian

a.
  1. Concave in front; as, procœlian vertebræ, which have the anterior end of the centra concave and the posterior convex. (Anat & Zool.)

Procœlian

n.
  1. A reptile having procœlian vertebræ; one of the Procœlia. (Zool.)