Gymnodont Copy link Gymnodont (jim"no*dont) , noun [Greek gymno`s naked + 'odoy`s, 'odo`ntos, tooth.] (Zoology) One of a group of plectognath fishes (Gymnodontes), having the teeth and jaws consolidated into one or two bony plates, on each jaw, as the diodonts and tetradonts. See Bur fish, Globefish, Diodon.