MONDO_0004975 (Alzheimer disease) is a progressive, neurodegenerative disease characterized by loss of function and death of nerve cells in several areas of the brain leading to loss of cognitive function such as memory and language. Also known as: AD, Alzheimer dementia, Alzheimer's dementia, Alzheimer's disease, Alzheimers dementia, Alzheimers disease, presenile and senile dementia.