zoanthidanhttp://www.oed.com/dictionary/zoanthidan_adj%3Ftab%3Dmeaning_and_usezoanthidan, adj.
First published 1921; not fully revised

zoanthidanadjective

Zoology.
  1. 1888–
    Stressed as zoˈanthidan.
    1. 1888
      A pair [of mesenteries] of the typical Zoanthidan structure.
      G. Rolleston & W. H. Jackson, Forms of Animal Life (ed. 2) 736

Originally published as part of the entry for zoantharian, adj. & n.

zoantharian, adj. & n. was first published in 1921; not fully revised.