What does the suffix -iatry specifically refer to?

The suffix -iatry specifically refers to treatment or a specialty within a particular field of medicine. This suffix is used to form terms that indicate the branch of medicine that focuses on diagnosing, treating, and preventing diseases and disorders. For example, "psychiatry" refers to the specialty dealing with mental health disorders, while "podiatry" pertains to the treatment of foot disorders.

The other options relate to different medical terminology concepts: "study of" is commonly associated with the suffix -ology, which refers to the study of a particular subject; "infection" does not have a suffix that directly translates to treatment or specialty, as it describes a condition rather than a branch of medical practice; and "repair" typically relates to surgical procedures often indicated by suffixes like -plasty or -orrhaphy, which do not convey the idea of treatment as a distinct medical specialty.