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presenile dementia

noun
  1. a form of dementia, of unknown cause, starting before a person is old
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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

presenile dementia in Medicine

presenile dementia

n.
  1. Any of various forms of dementia developing before old age.
  2. Alzheimer's disease. No longer in technical use.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.