WordReference Random House Unabridged Dictionary of American English © 2019
cer•a•top•si•an  (ser′ə topsē ən),USA pronunciation n. 
  1. Paleontologyany of several four-footed, herbivorous dinosaurs of the suborder Ceratopsia, of the late Cretaceous Period, having an enlarged skull with a beak, a large perforated frill at the back, and, in some species, one or three horns. Also called  horned dinosaur. 
  • Neo-Latin Ceratopsi(a) (see cerat-, -opsis, -ia) + -an

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