belonging to the Plectognathi, a group or order of fishes having the teeth fused into a beak and thick, often spiny, scaleless skin, and including the filefish, globefish, puffer, and triggerfish.
–noun
2.
a plectognath fish.
Origin: 1825–35; < NL Plectognathi, pl. of Plectognathus, equiv. to plecto- (< Gk plektós plaited, twisted; see -o-) + -gnathus-gnathous
[plek-tog-nath] 
tɒgˌnæθ