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Conelrad

[kon-l-rad]
noun
  1. a system formerly used by the U.S. civil defense system to prevent enemy planes or missiles from homing on radio and television frequencies.
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Origin of Conelrad

1955–60; con(trol of) el(ectromagnetic) rad(iation)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018