noun Pathology.
abnormal development of bony tissue.

1825–35; hyper- + ostosis

hyperostotic [hahy-per-o-stot-ik] , adjective
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World English Dictionary
hyperostosis (ˌhaɪpərɒˈstəʊsɪs)
n , pl -ses
1.  an abnormal enlargement of the outer layer of a bone
2.  a bony growth arising from the root of a tooth or from the surface of a bone

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American Heritage
Medical Dictionary

hyperostosis hy·per·os·to·sis (hī'pər-ŏ-stō'sĭs)
n. pl. hy·per·os·to·ses (-sēz)

  1. Excessive or abnormal thickening or growth of bone tissue.

  2. See exostosis.

hy'per·os·tot'ic (-ŏ-stŏt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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