/i gwah"neuh don', i gwan"euh-/ , n.
a plant-eating dinosaur of the genus Iguanodon that lived in Europe early in the Cretaceous Period and grew to a length of from 15 to 30 ft. (4.5 to 9 m) and walked erect on its hind feet.
[ iguan ( a ) IGUANA + Gk odón, var. of ODO S TOOTH]