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senile dementia

noun
🔊/ˌsiːnaɪl dɪˈmenʃə/
🔊/ˌsiːnaɪl dɪˈmenʃə/
 [uncountable]
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  1. a term used in the past for a serious mental disorder in old people that causes loss of memory, loss of control of the body, etc.老年痴呆Topics Life stagesc2, Illnessc2