from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in Alzheimer's disease.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease
Sorry, no etymologies found.
With the naked eye one can see in paresis, in senile dementia etc., the great diminution and disappearance of the cerebral cortex, adhesions between the cortex and the brain coverings, oedema of the ventricles, scars, shrinkages, softenings, changes in the blood-vessels, etc.