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senile dementia
se·nile de·men·tia


noun 
Definition:
 
dementia in later life: a form of brain disorder marked by progressive and irreversible mental deterioration, memory loss, and disorientation, known to affect some people in later life
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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