ˈkän ə lˌrad, -ˌraa(ə)d noun
( -s )
Etymology: con trol of elec tromagnetic rad iation
: a system for preventing an enemy from using radio signals from any particular AM station as a guide for aircraft or missiles by shifting all AM stations to either of the frequencies 640 or 1240 and having them broadcast in a group in random order for short intervals on only these frequencies