amentia
n.
"mental deficiency," late 14c., from Latin amentia "madness," from amentem "mad," from a- "away from" + mentem "mind" (see mind, n.) + abstract noun ending -ia.
〔李〕[a-;ment;-ian.] n.智力缺陷； 精神错乱 ←ment (L mens,mentis)=mind 精神
〔蒋〕[a-无，缺乏，ment智，智力，-ia名词后缀，表示疾病;’缺乏智力”] (医学)智力缺陷