zygologicalhttp://www.oed.com/dictionary/zygological_adj%3Ftab%3Dmeaning_and_usezygological, adj.
First published 1986; not fully revised

zygologicaladjective

  1. 1978–
    Stressed as zygoˈlogical.
    1. 1978
      Not that adhesion is the only zygological process available for joining one piece of plastics material to another.
      Engin. Materials & Design April 37/2

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

zygology, n. was first published in 1986; not fully revised.