Noun | 1. | electromagnetic spectrum - the entire frequency range of electromagnetic waves radio frequency - an electromagnetic wave frequency between audio and infrared extremely low frequency, ELF - below 3 kilohertz very low frequency, VLF - 3 to 30 kilohertz LF, low frequency - 30 to 300 kilohertz medium frequency, MF - 300 to 3000 kilohertz high frequency, HF - 3 to 30 megahertz very high frequency, VHF - 30 to 300 megahertz UHF, ultrahigh frequency - 300 to 3000 megahertz SHF, superhigh frequency - 3 to 30 gigahertz EHF, extremely high frequency - 30 to 300 gigahertz spectrum - an ordered array of the components of an emission or wave actinic radiation, actinic ray - electromagnetic radiation that can produce photochemical reactions gamma radiation, gamma ray - electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength infrared spectrum - the spectrum of infrared radiation light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window" line - a single frequency (or very narrow band) of radiation in a spectrum microwave - a short electromagnetic wave (longer than infrared but shorter than radio waves); used for radar and microwave ovens and for transmitting telephone, facsimile, video and data microwave spectrum - the part of the electromagnetic spectrum corresponding to microwaves radio spectrum, radio-frequency spectrum - the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television ultraviolet spectrum - the spectrum of ultraviolet radiation color spectrum, visible spectrum - the distribution of colors produced when light is dispersed by a prism |