Stealth aircraft are designed to avoid detection using a variety of advanced technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology. Development of stealth technology likely began in Germany during World War II, the planned Horten Ho 229 bei...
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http://en.wikipedia.org/wiki/Stealth_aircraft
noun an aircraft designed in accordance with technology that makes detection by radar difficult
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https://www.encyclo.co.uk/local/20974
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