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senile dementia

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noun Pathology.
  1. a syndrome of progressive, irreversible impairment of cognitive function, caused by organic factors and having its onset late in life.
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Origin of senile dementia

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for senile dementia

senile dementia

noun
  1. dementia starting in old age with no precipitating physical cause
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

senile dementia in Medicine

senile dementia

n.
  1. A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in Alzheimer's disease.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.