pro·to·cer·a·tops 
(prō′tō-sĕrə-tŏps′)
(prō′tō-sĕrə-tŏps′)n.
A small herbivorous ceratopsian dinosaur of the genus Protoceratops of the Cretaceous Period, characterized by a bony frill on the back of the skull and a beaked mouth.
[New Latin Prōtocerātōps, genus name : Greek prōto-, proto- + Greek keras, kerāt-, horn; see ker-1 in the Appendix of Indo-European roots + Greek ōps, eye, face; see okw- in the Appendix of Indo-European roots.]