radio_spectrum has definitions from the field of physics
[ noun ] (physics) the entire spectrum of electromagnetic frequencies used for communications; includes frequencies used for radio and radar and television

Used in print

(1961 Research Highlights of the National Bureau of...)

High sensitivity in radio_telescopes is achieved by reducing the bandwidth of the receiver ; therefore , only with precise foreknowledge of the line frequencies is an astronomical search for the radio_spectra of these molecules feasible .