Source : Webster's Revised Unabridged Dictionary (1913)

Polygordius \Pol`y*gor"di*us\, n. [NL. See {Poly-}, and
   {Gordius}.] (Zo["o]l.)
   A genus of marine annelids, believed to be an ancient or
   ancestral type. It is remarkable for its simplicity of
   structure and want of parapodia. It is the type of the order
   Archiannelida, or Gymnotoma. See {Loeven's larva}.