con·​el·​rad | \ˈkänᵊlˌrad, -ˌraa(ə)d\
plural -s

Definition of conelrad 

: 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

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History and Etymology for conelrad

control of electromagnetic radiation

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