Pachycephalosaurus
pachycephalosaurus
(pāk’ĭ-sěf’ə-lə-sôr’əs)
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 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.
- Pachyderm
[pak-i-durm] /ˈpæk ɪˌdɜrm/ noun 1. any of the thick-skinned, nonruminant ungulates, as the elephant, hippopotamus, and rhinoceros. 2. an elephant. 3. a person who is not sensitive to criticism, ridicule, etc.; a thick-skinned person. /ˈpækɪˌdɜːm/ noun 1. any very large thick-skinned mammal, such as an elephant, rhinoceros, or hippopotamus n. 1838, from French pachyderme (c.1600), […]