conelrad
noun
con·el·rad
\ˈkänəlˌrad, -ˌraa(ə)d\
Definition of conelrad
-s
: 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
From the M-W Editors
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Origin and Etymology of conelrad
control of electromagnetic radiation
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