phacomatosis
noun
phaco·ma·to·sis
| \ ˌfak-ō-mə-ˈtō-səs
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plural phacomatoses\ -ˌsēz
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Medical Definition of phacomatosis
: any of a group of hereditary or congenital diseases (as neurofibromatosis) affecting the central nervous system and characterized by the development of hamartomas