- 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.
- a plectognath fish.
- any spiny-finned marine fish of the mainly tropical order Plectognathi (or Tetraodontiformes), having a small mouth, strong teeth, and small gill openings: includes puffers, triggerfish, trunkfish, sunfish, etc
- of, relating to, or belonging to the order Plectognathi
