a usually progressive condition (such as Alzheimer's disease) marked by the development of multiple cognitive deficits (such as memory impairment, aphasia, and the inability to plan and initiate complex behavior)
dementias
noun(de-men-tia)
madness, insanity
dementias
noun(de-men-tia)
dementia of old age especially of the degenerative type associated with Alzheimer's disease