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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.

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
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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.