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
adjective also: plectognathic, plectognathous
2.
of, relating to, or belonging to the order Plectognathi
Word origin
C19: via New Latin from Greek plektos twisted + gnathos jaw