i•at•ro•gen•ic (aiætredzénik) adj. (med.) resulting from the activity of a physician. Originally applied to a disorder or disorders inadvertently induced in the patient by the manner of the physician’s examination, discussion, or treatment (Cf HALO EFFECT), it nows applies to any condition occurring in a patient as a result of medical treatment, such as a drug reaction [f. Gk iatros physician + -o- + -GENIC]