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radar

noun [U]
 
 
/ˈreɪ.dɑːr/ US  /-dɑːr/

Definition

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)
Focus on the pronunciation of radar