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A large pachycephalosaurian dinosaur of the genus Pachycephalosaurus, having a thick domed skull with bony knobs and a long tail. Also called pachycephalosaur.

[New Latin Pachycephalosaurus, genus name : Greek pakhus, thick + Greek kephalē, head; see ghebh-el- in Indo-European roots + Greek sauros, lizard.]


A medium-sized, plant-eating dinosaur of the late Cretaceous Period having a domed skull up to 10 inches (25.4 centimeters) thick.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pachycephalosaurus - bipedal herbivore having 10 inches of bone atop its headpachycephalosaurus - bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found
bone-headed dinosaur - bipedal herbivorous dinosaurs with bony crowns
References in periodicals archive ?
Pachycephalosaurus wyomingensis had a large domed skull that some argue was used to butt heads in dominance displays.
Other items for sale include the world's only known skeleton of the dinosaur Pachycephalosaurus wyomingensis and the only postcard from the Titanic.
Confirmed for auction are: Princess Diana's Swan Lake Diamonds, made for the late Princess by the Royal Family's Crown Jeweler; the world's only known fossilized skeleton of the 65-million-year-old bizarre dinosaur known as Pachycephalosaurus wyomingensis ("Pachy"); Vostak 3KA2, the world's first spacecraft designed for human spaceflight to successfully orbit and return to Earth, carrying a dog and a mannequin; the world's only postmarked letter to survive the Titannic, from young survivor Clear Annie Cameron to her sister; the only privately owned handwritten copy of Clement Moore's 177-year-old classic "A Visit from St.