zygoneuroushttp://www.oed.com/dictionary/zygoneurous_adj%3Ftab%3Dmeaning_and_usezygoneurous, adj.
First published 1921; not fully revised

zygoneurousadjective

  1. 1901–
    Applied to an arrangement of the nervous system in certain gastropod molluscs, in which the pallial nerve of each pleural ganglion unites directly with the ganglion of the visceral commissure of its own side (opposed to dialyneurous).
    1. 1901
      A Vivipara possessing a single zygoneurous connection on the left and the normal dialoneurous relationship of the nerves upon the right.
      Proceedings of Zoological Society 466

Originally published as part of the entry for zygo-, comb. form

zygo-, comb. form was first published in 1921; not fully revised.