a serious mental disorder caused by brain disease or injury, that affects the ability to think, remember and behave normally 痴呆 patients with dementia 痴呆症患者 a dementia sufferer/patient 痴呆症患者/病人 She was diagnosed with dementia. 她被诊断患有痴呆症。 111 people in the study subsequently developed dementia. 研究中的111人随后患上了痴呆症。 The staff have specialist training in dementia care. 工作人员接受了痴呆症护理方面的专业培训。
Word Originlate 18th cent.: from Latin, from demens, dement- ‘out of one's mind’.