A psychiatrist is a physician who specializes in psychiatry, which is to say in the diagnosis and treatment of mental disorders. Psychiatrists are medical doctors, unlike psychologists, and must evaluate patients to determine whether their symptoms are the result of a physical illness, a combination of physical and mental, or a strictly psychiatric one. The translation from Greek and Latin origin is as follows: "Psych"-Greek transliterated meaning breath, life, soul, spirit or mind; "Iatro" is Greek for physician and -ist in Latin comes from "ista or iste" and the pronoun means "that one" or "specialist".