老人痴呆症 lǎorénchīdāizhèng Alzheimer's disease Definitions Defs Origin Strokes Stroke Words Sentences Sents 老人 lǎorén noun old person an elderly person; an old man or woman; the aged痴呆症 chīdāizhèng noun dementia a chronic or persistent disorder of the mental processes caused by brain disease or injury and marked by memory disorders, personality changes, and impaired reasoning