radar

[rey-dahr]

noun

1. Electronics.,  a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns.

2. a means or sense of awareness or perception.

   lobbyists working under the media's radar.

radar

/ ˈreɪdɑː /

noun

1. Former name: radiolocation. 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

2. the equipment used in such detection

radar

1. A method of detecting distant objects and determining their position, speed, material composition, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps.

2. The equipment used in such detecting.

3. See also Doppler effect lidar sonar

radar

1. A method of finding the position and velocity of an object by bouncing a radio wave off it and analyzing the reflected wave. Radar is an acronym for ra dio d etection a nd r anging.

Police use radar techniques to determine the speed of automobiles.

Other Word Forms

• antiradar noun

Word History and Origins

Origin of radar¹

1940–45, ra(dio) d(etecting) a(nd) r(anging)

Word History and Origins

Origin of radar¹

C20 ra ( dio ) d ( etecting ) a ( nd ) r ( anging )

Example Sentences

Archaeologists are to resume digging at the Ness of Brodgar on Orkney after 3D radar technology led to an "extraordinary discovery".

Read more on BBC

Gripes ranged from the new colour scheme for the rain radar, to furious farmers and fishermen who could no longer put in GPS coordinates to find forecasts for a specific location.

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Rare earths are crucial for the defence sector -- used in fighter jets, missile guidance systems and radar technology -- while also having a range of uses in everyday products including smartphones, medical equipment and automobiles.

Read more on Barron's

Although their work for Epstein has been detailed in several civil lawsuits, Kahn and Indyke have largely stayed under the radar.

Read more on The Wall Street Journal

But Scott Boland began to find his radar when they returned.

Read more on Barron's

Related Words

• sonar