| a syndrome of progressive, irreversible impairment of cognitive function, caused by organic factors and having its onset late in life. |

| senile dementia n. A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in Alzheimer's disease. |
senile dementia n.
A progressive, abnormally accelerated deterioration of mental faculties and emotional stability in old age, occurring especially in Alzheimer's disease.