Source : Webster's Revised Unabridged Dictionary (1913)

Gordiacea \Gor`di*a"ce*a\, n. pl. [NL. See {Gordian}, 1.]
   (Zo["o]l.)
   A division of nematoid worms, including the hairworms or hair
   eels ({Gordius} and {Mermis}). See {Gordius}, and
   Illustration in Appendix.