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radar

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radar/ˈreɪˌdɑɚ/noun
pluralradars
radar
/ˈreɪˌdɑɚ/
noun
pluralradars
Learner's definition of RADAR  
: a device that sends out radio waves for finding out the position and speed of a moving object (such as an airplane)
[count]
[noncount]
— often used figuratively in informal U.S. English
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