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Alz′hei•mer's disease`(ˈɑlts haɪ mərz, ˈælts-, ˈɔlts-)
a common form of dementia of unknown cause, usu. beginning in late middle age, characterized by progressive memory loss and mental deterioration associated with brain damage.
[after Alois Alzheimer (1864–1915), German neurologist, who described it in 1907]