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psychiatrist meaning, definition, what is psychiatrist: a doctor who is also trained in psychiatry. Learn more.
A psychologist is usually a PhD or PsyD and cannot prescribe prescription drugs. A psychiatrist in a medical physician with a specialty in psychiatry. Therefore they are autho â¦ rized to treat patients both psychologically as well as medically through the use of psychoactive drug treatments.sychiatrists are medical doctors who provide both medical and psychological therapy treatments. Psychologists can counsel patients, as can psychiatrists, but only psychiatrists can prescribe medicinal drugs and therapy treatments.