alienist
/ˈeɪljənɪst/noun
1- former term for PSYCHIATRIST.〈旧〉 同PSYCHIATRIST.
1.1
- chiefly US a psychiatrist who assesses the competence of a defendant in a law court〈主美〉精神病学家（在法庭上鉴定被告行为能力者）。
词源
mid 19th cent.: from French aliéniste, based on Latin alienus 'of another'（see ALIEN）.