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| pach·y·ceph·a·lo·saur [ pàki séffələ sàwr ] (plural pach·y·ceph·a·lo·saurs) or pach·y·ceph·a·lo·saur·us [ pàki seffələ sáwrəss ] (plural pach·y·ceph·a·lo·saur·us·es) |
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| Definition: |
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plant-eating dinosaur with thick skull: a plant-eating dinosaur of the late Cretaceous and Jurassic periods that walked on its hind legs and had a very thick skull covered with knobs or spikes. Suborder Pachycephalosauria.
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| [Mid-20th century. < modern Latin Pachycephalosauria< Greek pakhus "thick" + kephalē "head, skull" + sauros "lizard"] |
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