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English definition of “radar”

radar

noun [U]     /ˈreɪ.dɑːr/ US  /-dɑːr/
a system that uses radio waves to find the position of objects that cannot be seen : Other vessels in the area show up on the ship's radar ( screen ).Radio
(Definition of radar noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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