KJR Views 5 meanings found KJR can refer to the Korean Journal of Radiology, a medical research periodical, as well as a colloquial term for a kneeājerk reaction, and it is also used as the call sign for a Seattle radio station. Miscellaneous Kreis Jugend Ring Korean Journal of Radiology Knee Jerk Reaction Community AM-950 AM, FM-95.7, Seattle, Washington Regional Kiski Junction Railroad