ginglymodi

from The Century Dictionary.

• An order of fishes, of the subclass Ganoidea.

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

• noun (Zoöl.) An order of ganoid fishes, including the modern gar pikes and many allied fossil forms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebræ convex in front and concave behind, forming a ball and socket joint. See ganoidel.