neu·ro·fi·bro·ma·to·sis 
(nr′ō-fī′brō-mə-tōsĭs, nyr′-)
(nr′ō-fī′brō-mə-tōsĭs, nyr′-)n. Abbr. NF
Any of several genetic diseases characterized by the development of benign tumors of the nerves and, in the most common form, associated with abnormal skin pigmentation and bone deformities.