Definition of radar in English:


Syllabification: ra·dar
Pronunciation: /ˈrāˌdär


  • 1A system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves that are reflected off the object back to the source.
    More example sentences
    • Chavez reported that Venezuelan radar detected the presence of the ships and planes during the coup attempt.
    • That expelling of exhaust is vital in detecting their presence on radar.
    • Digital cellphones are similar to radar, using pulses carried by microwaves.
  • 1.1An apparatus used for radar.
    More example sentences
    • Invading foreign computer networks could shut down radars and electrical plants and disrupt telephone lines without firing a shot.
    • Cyclone detection doppler radars are replacing the conventional analogue radars in important locations along the east coast.
    • Park Air is a world leader in the field of integration, processing and display of data from radars, sensors and databases.
  • 1.2Used to indicate that someone or something has or has not come to the attention of a person or group: the band has been kind of off the radar these past few years


1940s: from ra(dio) d(etection) a(nd) r(anging).

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