zygapophysialhttp://www.oed.com/dictionary/zygapophysial_adj%3Ftab%3Dmeaning_and_usezygapophysial, adj.
First published 1921; not fully revised

zygapophysialadjective

Anatomy and Zoology.
  1. 1870–
    Pertaining to a zygapophysis.
    1. 1870
      Two oblique zygapophysial surfaces.
      G. Rolleston, Forms of Animal Life 11

Originally published as part of the entry for zygapophysis, n.

zygapophysis, n. was first published in 1921; not fully revised.