alienist

1. (dated) An expert in mental illness, especially with reference to legal ramifications.Examples: "‘Are you an alienist?’ I interrupted. ‘Every doctor should be - a little,’ answered that original, imperturbably."; "A trial for poisoning means an exhaustive study not only of analytic chemistry, but of practical medicine on the part of all the lawyers in the case, while a plea of insanity requires that, for the time being, the district attorney shall become an alienist, familiar with every aspect of paranoia, dementia praecox, and all other forms of mania."; ""Speaking as a medical man," said I, "it appears to be a case for an alienist. The old gentleman's cerebral processes were disturbed by the love affair.[…]""dated

2. (dated) A psychiatrist.dated