e·lec·tro·mag·net·ic /ɪˌlektrəʊmæɡˈnetɪk◂ $ -troʊ-/ BrE AmE adjective technical
relating to both electricity and ↑ magnetism , or having both electrical and ↑ magnetic qualities:
electromagnetic waves
the electromagnetic spectrum (=different waves of energy, including light, heat, radio waves, and ↑ X-ray s )