Alz·hei·mer’s disease (älts?h?-m?rz, ?lts?-, ôlts?-, ôlz?-)n. A degenerative disease of the brain, occurring chiefly in elderly people and characterized by disorientation, memory failure, speech disturbances, and the progressive loss of mental capacity. It is associated with the formation of beta-amyloid plaques and neurofibrillary tangles in the cerebral cortex and loss of neurons.[After Alois Alzheimer (1864-1915), German neurologist.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Alzheimer’s disease (?ælts?ha?m?z) n (Pathology) a disorder of the brain resulting in a progressive decline in intellectual and physical abilities and eventual dementia. Often shortened to: Alzheimer’s [C20: named after A. Alzheimer (1864?1915), German physician who first identified it]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Alz?hei?mer’s disease` (??lts ha? m?rz, ?ælts-, ??lts-) n. 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] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.Alz·heim·er’s disease (äls?h?-m?rz) A disease that causes degeneration of parts of the brain. Symptoms include the gradual loss of memory and other mental abilities. Alzheimer’s disease most commonly affects the elderly.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Alzheimer’s diseaseThe progressive degeneration of the brain resulting in dementia (mental deterioration).Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited