any of a suborder (Ceratopsia) of horned ornithischian dinosaurs of the Cretaceous with a beaklike snout and a bony crest at the back of the head
adjective
of the ceratopsians
See ceratopsian in American Heritage Dictionary 4
(sĕrˌə-tŏpˈsē-ən)
noun
Any of various herbivorous quadrupedal ornithischian dinosaurs of the suborder Ceratopsia of the late Jurassic and Cretaceous periods, having a bony frill covering the neck, a beaked mouth, and one or more horns on the head.