(1)精神病学家；精神病医生
现已很少用，指专门致力于精神疾病或精神缺陷方面研究的医生。

(2)精神病鉴定专家
指凭借经验、知识，在某一特定时间，就被告人的精神状况进行检查并作出鉴定意见的人。

• undisputed fact
• undistributed profits
• undistributed profits tax
• undivided interest
• undivided profit
• undivided right
• undres
• undue influence
• undue means
• undue return
• unearned income
• unearned increment
• unearned interest
• unearned premium
• unearned premium reserve
• unearned surplus
• U.N.E.F.
• unemancipated minor
• unemployment insurance
• unemployment relief arrangement
• unemployment tax
• unemployment trust fund
• unencumbered
• unenforceable contract
• unequal