Radar is a way of discovering the position or speed of objects such as aircraft or ships when they cannot be seen, by using radio signals.
Pilots complained that the radars in the Mirages malfunctioned during conditionsof high humidity.
The aircraft was on a flight from Milan when it disappeared from radar screens.
radar in British English
(ˈreɪdɑː)
noun
1.
a method for detecting the position and velocity of a distant object, such as an aircraft. A narrow beam of extremely high-frequency radio pulses is transmitted and reflected by the object back to the transmitter, the signal being displayed on a radarscope. The direction of the reflected beam and the time between transmission and reception of a pulse determine the position of the object
Former name: radiolocation
2.
the equipment used in such detection
Word origin
C20 ra(dio) d(etecting) a(nd) r(anging)
radar in American English
(ˈreɪˌdɑr)
US
noun
any of several systems or devices using transmitted and reflected radio waves for detecting a reflecting object, as an aircraft, and determining its direction,distance, height, or speed, or in storm detection, mapping, navigation, etc.
Word origin
ra(dio) d(etecting) a(nd) r(anging)
More idioms containing
radar
drop off the radar
Examples of 'radar' in a sentence
radar
It has an unmanned turret, radar used in fighter jets and an armoured capsule for crew.
The Sun (2016)
Two kinds of radar are used to track air traffic from the ground.
Times, Sunday Times (2014)
Some of them had a device that told them they were held in the invisible radar beam.
Len Deighton Bomber
You have to put yourselves on the radar screen.
Times, Sunday Times (2015)
They ripped through the floor after a radar equipment survey showed suspicious shadows.
The Sun (2010)
In the past calls were banned over fears the signal would interfere with aircraft radar.
The Sun (2009)
He will try to keep dealings under the radar again this time.
The Sun (2013)
There have been things emerging that are on our radar screen.
Times, Sunday Times (2014)
The radar and radio equipment alone equalled a million radio sets.
Len Deighton Bomber
Flying under the radar for the time being may not be a bad thing.
Times, Sunday Times (2012)
Some painters just disappear from the radar screen through no fault of their own.
Times, Sunday Times (2007)
But we kept it under the radar at the time.
The Sun (2012)
For six hours the radar screens remained blank.
Patrick Bishop FIGHTER BOYS: Saving Britain 1940 (2003)
And they flew them without the aid of radar or radio and had no weapons to defend themselves.
The Sun (2015)
The smallest are carried high into the atmosphere and cannot be detected by radar or other aircraft instruments.
Times, Sunday Times (2010)
They decided to dig where the dog alerted and where radar equipment picked up anomalies in the ground.
Times, Sunday Times (2009)
Glasgow again detected their radar pulses.
Admiral Sandy Woodward, With Patrick Robinson ONE HUNDRED DAYS (2003)
My responsibilities were for airborne radio, radar and other electronic equipment.
Times, Sunday Times (2012)
This led to radar tracking of aircraft in the 1930s.
Times, Sunday Times (2006)
Elstree has no instrument landing system, radar or directional radio beacons.
Times, Sunday Times (2014)
The radar equipment either did not work or was switched off, or the tunnel was simply missed.
Times, Sunday Times (2015)
A primary radar sends out signals and listens for echoes that bounce back from objects in the sky.
Times, Sunday Times (2014)
Some units can detect the radar or laser signals emitted by the gun and either block it or warn the driver he is being tracked.
Times, Sunday Times (2006)
It flew low on the 90-minute journey, hugging the mountainous landscape and skimming over forests as if anxious to avoid radar detection.
Times, Sunday Times (2008)
In other languages
radar
British English: radar /ˈreɪdɑː/ NOUN
Radar is a way of discovering the position or speed of objects such as aircraft or ships by using radio signals.
...a ship's radar screen.
American English: radar
Arabic: رادار
Brazilian Portuguese: radar
Chinese: 雷达
Croatian: radar
Czech: radar
Danish: radar
Dutch: radar
European Spanish: radar
Finnish: tutka
French: radar
German: Radar
Greek: ραντάρ
Italian: radar
Japanese: レーダー
Korean: 레이더
Norwegian: radar
Polish: radar
European Portuguese: radar
Romanian: radar
Russian: радар
Latin American Spanish: radar
Swedish: radar
Thai: เรดาห์
Turkish: radar
Ukrainian: радар
Vietnamese: hệ thống radar
All related terms of 'radar'
pulse radar
a radar system using pulse modulation
radar trap
a section of road on which the police check the speed of vehicles, often using radar
radar beacon
a device for transmitting a coded radar signal in response to a signal from an aircraft or ship. The coded signal is then used by the navigator to determine his or her position
radar scanner
→ another name for scanner (sense 3 )
radar screen
a screen on equipment used in radar , a method for detecting the position and velocity of a distant object
radar sensor
a sensor on equipment used in radar , a method for detecting the position and velocity of a distant object
weather radar
radar designed or suitable for use in detecting clouds and precipitation
radar astronomy
the use of radar to map the surfaces of the planets , their satellites , and other bodies
radar operator
someone who operates the equipment used in radar , a method for detecting the position and velocity of a distant object
tracking radar
a radar system emitting a narrow beam which oscillates about the target , thus compensating for abrupt changes of direction
drop off the radar
to be forgotten or ignored because people's attention has moved to something more important
to be off the radar
to no longer be noticed or important
to be on the radar
to be noticed or important
to vanish from the radar screens
to go missing ; to no longer be visible or able to be detected by anyone