Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: radio detection and ranging

radar

 noun
     
ra‧dar [uncountable and countable]
TT a piece of equipment that uses radio waves to find the position of things and watch their movement [↪ sonar]:
The coastline can now be monitored by radar.
We could see the plane quite clearly on the radar screen.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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