nematognathi

from The Century Dictionary.

• An order of teleost fishes in which the supramaxillary bones are lateral and short or rudimentary, and covered with skin which forms barbels at each corner of the mouth, whence the name; the nematognaths or catfishes.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of fishes having barbels on the jaws. It includes the catfishes, or siluroids. See siluroid.