1) Marginocephalian 
Marginocephalia (`fringed heads`) is a clade of ornithischian dinosaurs that includes the thick-skulled pachycephalosaurids, and horned ceratopsians. They were all herbivores, walking on two or four legs, and are characterized by a bony ridge or frill at the back of the skull. The clade evolved in the Jurassic period, and became common in the Up.....
Marginocephalians meaning fringed heads) are a group of Ornithischian (bird-hipped) dinosaurs that have a distinctive skull structure (a slight shelf or bony frill on the back of the skull). These plant-eaters include the ceratopsians (horned dinosaurs like Triceratops , Styracosaurus , Pentaceratops, Protoceratops , etc.) and the Pachycephalosauri...
[n] - includes bone-headed (pachycephalosaurs) and horned (ceratopsian) dinosaurs
suborder Marginocephalia noun includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs