noun
: energy traveling as a wave motion ; specifically : the energy of electromagnetic waves (as radio waves; infrared rays, visible light, ultraviolet rays, X rays, and gamma rays) — compare luminous energy
noun
: energy traveling as a wave motion ; specifically : the energy of electromagnetic waves (as radio waves; infrared rays, visible light, ultraviolet rays, X rays, and gamma rays) — compare luminous energy
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012