American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
In 2004, scientists unearthed the fossil of a small dinosaur evolution and completely wiping out theories of co-evolution in ornithischian dinosaurs.— CreationWiki - Recent changes [en]
The fossil is a member of the ornithischian group of dinosaurs that diverged about— New Scientist - Online News
A computer-generated image of the Tianyulong confuciusi, a feathered heterodontosaurid ornithischian dinosaur.— canada.com Top Stories
Fruitadens is also the smallest ornithischian dinosaur ever found.— post-gazette.com - News
Pachycephalosaurids are a group of ornithischian dinosaurs united by the presence of cranial ornamentation and an enlarged frontoparietal dome, a unique morphology among vertebrates.— PLoS ONE Alerts: New Articles

American Heritage Dictionary (1)
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