A large herbivorous dinosaur of the genus Pachycephalosaurus of the late Cretaceous Period. It grew to about 7.6 m (25 ft) long and had a domed skull up to 25.4 cm (10 inches) thick that was lined with small bumps and spikes. The thick skull may have been used for head-butting during mating displays.


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  • Pachycephaly

    pachycephaly pach·y·ceph·a·ly (pāk’ē-sěf’ə-lē) n. Abnormal thickness of the skull. pach’y·ce·phal’ic (pāk’ē-sə-fāl’ĭk) adj. pachycephaly pach·y·ceph·a·ly (pak-i- sef’ā-lē) n. Abnormal thickness of the skull. pachycephalic adj.

  • Pachycheilia

    pachycheilia pach·y·chei·li·a or pach·y·chi·li·a (pāk’ĭ-kī’lē-ə) n. Swelling or abnormal thickness of the lips.

  • Pachychromatic

    pachychromatic pach·y·chro·mat·ic (pāk’ē-krō-māt’ĭk) adj. Having coarse chromatin threads.

  • Pachydactyly

    pachydactyly pach·y·dac·ty·ly (pāk’ē-dāk’tə-lē) n. Abnormal enlargement of the fingers or toes.

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