| neurodegenerative diseases | A varied assortment of central nervous system disorders characterised by gradual and progressive loss of neural tissue. (cecil textbook of medicine, 20th ed, p2050) (12 Dec 1998) |
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| neurodegenerative disorder | A type of neurological disease marked by the loss of nerve cells. See: Alzheimer's disease, Parkinson's disease. (22 May 1997) |