from the GNU version of the Collaborative International Dictionary of English
- plural proper n. An order of herbivorous dinosaurs with birdlike characteristics in the skeleton, esp. in the pelvis and hind legs, which in some genera had only three functional toes, and supported the body in walking as in Iguanodon. See Illust. in Appendix.
from The Century Dictionary and Cyclopedia
- An order of Dinosauria, containing extinct herbivorous dinosaurs whose hind feet most nearly approached those of birds in structure and function.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)
Sorry, no etymologies found.
I read a paper in the new JVP, "A new basal hadrosauroid (Dinosauria, Ornithopoda) from the Turonian of New Mexico."
Owenodon (Ornithopoda; Iquandodontia: new designation for Iguanodon hoggi) 27.
Infraorder: Ornithopoda (bird-footed) reptiles best known for the varieties that reached enormous sizes.