Ceratopsia

plural noun

Cer·a·top·sia | \ ˌser-ə-ˈtäp-sē-ə\

Definition of Ceratopsia

: a group of large dinosaurs, usually made a suborder of the order Ornithischia, known chiefly from the Upper Cretaceous of North America and Mongolia, and comprising animals of robust build that walked on all four feet and had an enormously developed skull, long horns, and a sharp horny beak — see triceratops

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