1875, from psychiatry + -ist.
A psychiatrist is a man who goes to the Folies Bergère and looks at the audience. [Anglican Bishop Mervyn Stockwood, 1961]An older name was mad-doctor (1703); also psychiater "expert in mental diseases" (1852), from Greek psyche + iatros. Also cf. alienist.
psychiatrist psy·chi·a·trist (sĭ-kī'ə-trĭst, sī-)
n.
A physician who specializes in psychiatry.