Alzheimer's disease /ˈɑːltsˌhaɪmɚz-/ noun Learner's definition of ALZHEIMER'S DISEASE
[noncount]
: a disease of the brain that causes people to slowly lose their memory and mental abilities as they grow old阿尔茨海默病;早老性痴呆;老年性痴呆 — called also Alzheimer's