1) Duck-billed dinosaur 2) Hadrosaur 3) Hadrosaurus 4) Trachodont 1) Trachodont 
Trachodon (meaning `rough tooth`) is a dubious genus of hadrosaurid dinosaur based on teeth from the Campanian-age Upper Cretaceous Judith River Formation of Montana, U.S.A. It is a historically important genus with a convoluted taxonomy that has been all but abandoned by modern dinosaur paleontologists. Despite being used for decades as the ico.....
Trachodon meaning rough tooth) is a plant-eating dinosaur that is known only from a few teeth and parts of the jaw that were found in Montana, USA. It dates from the late Cretaceous period , about 77-73 million years ago. From the teeth, it has been surmised that it was probably a duck-billed dinosaur (a lambeosaurine hadrosaur). Trachodon was name...
[n] - large duck-billed dinosaur of the Upper Cretaceous
trachodont noun large duck-billed dinosaur of the Cretaceous period