nematognathi

from The Collaborative International Dictionary of English v.0.48

Nematognathi \Nem`a*tog"na*thi\, n. pl. [NL. See {nemato-}, and
   {Gnathic}.] (Zool.)
   An order of fishes having barbels on the jaws. It includes
   the catfishes, or siluroids. See {Siluroid}.
   [1913 Webster]