Marginocephalian Definition
 märjə-nō-sə-fălē-ən 
    noun
  
 Any of various herbivorous ornithiscian dinosaurs of the group Marginocephalia of the Cretaceous Period, characterized by a bony shelf or frill at the back of the skull and including the ceratopsians and the pachycephalosaurians.
 American Heritage 
Synonyms: 
  - suborder Marginocephalia
 - Marginocephalia
 
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