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Medical Definition of Phacomatosis
1. A generic term for a group of hereditary diseases characterised by hamartomas involving multiple tissues; e.g., von Hippel-Lindau's disease, neurofibromatosis, Sturge-Weber syndrome, tuberous sclerosis. Synonym: phakomatosis. Origin: Van der Hoeve's coinage fr. G. Phakos, mother-spot (05 Mar 2000)