senile dementia
US /ˌsiː.naɪl dɪˈmen.ʃə/
UK /ˌsiː.naɪl dɪˈmen.ʃə/
1.
a general term for a decline in mental ability severe enough to interfere with daily life, often associated with old age
:
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The doctor diagnosed her with senile dementia.
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Early signs of senile dementia can include memory loss and confusion.