radar meaning

[ 'reidə ] Pronunciation:   "radar" in a sentence
  • Noun: radar  reydaa(r)
    1. Measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
      - microwave radar, radio detection and ranging, radiolocation

    Derived forms: radars

    Type of: measuring device, measuring instrument, measuring system

    Encyclopedia: Radar

  • [Business]


    below the radar (screen)

    if something is below the radar, people are not aware of it:

    It could be a nice small business with a solid income if it stays below the radar screen.

    on/off the radar (screen)

    used to say that people are aware or not aware of sth, or are thinking or not thinking about it:

    This sale was not even on our radar.

    Gold is coming back onto investors' radar screens.

    Dozens of companies have fallen off the radar screen of City investors following sharp falls in their share prices.

  • [Defence]
    A radio detection device that provides information on range, azimuth, and/or elevation of objects.

  • [Electronics]
    1. A microwave system for detecting objects and determining their distance, direction, heading, speed, and other characteristics. Signals from the transmitter are reflected back to the transmitter site by the object, and the reflection (sometimes along with the transmission) is displayed on a cathode-ray screen. The name is an

    acronym for radio detection and ranging.
    2. The theory and application of radio detection and ranging systems as defined in
    radar altitude The distance of an aircraft above the surface of the earth, as determined by radar. This value varies with the terrain over which the aircraft passes.

  • [Medicine]
    A system using beamed and reflected radio signals to and from an object in such a way that range,bearing,and other characteristics of the object may be determined.


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  1. enemy planes were picked up by our radar.
  2. densities presumably can be probed by radar.
  3. the pervading tone in the radar room was calm.
  4. they picked up the yacht on their radar screen.
  5. they were able to position the yacht by means of radar.

Related Words

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  7. radar alert meaning
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  10. radar antenna meaning
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