NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,079 terms related to cancer and medicine.
Radiation that has both electric and magnetic fields and travels in waves. It comes from natural and man-made sources. EMR can vary in strength from low energy to high energy. It includes radio waves, microwaves, infrared light, visible light, ultraviolet light, x-rays, and gamma rays. Also called electromagnetic radiation.