amyloid plaque
noun [ C ] medical specialized uk/ˌæm.ɪ.lɔɪd ˈplɑːk/ /ˌæm.ɪ.lɔɪd ˈplæk/ us/ˌæm.ɪ.lɔɪd ˈplæk/
淀粉状蛋白斑
a collection of the protein amyloid that forms in the brains of people with Alzheimer's disease (= a disease affecting memory, speech, and the ability to think clearly)