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radar

[rey-dahr]

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noun

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.

a means or sense of awareness or perception: lobbyists working under the media's radar.

Origin:
1940–45, Americanism; ra(dio) d(etecting) a(nd) r(anging)

Related forms

an·ti·ra·dar, noun, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To radar

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Radar is always a great word to know.

So is capacitive time constant. Does it mean:

root mean square value

time taken for charge to decay to 1 over the natural logarithm of its initial value

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Example Sentences

Makers of the little black boxes, which alert drivers to the presence of police radar and help them avoid.

Community colleges can no longer fly under the radar.

Another way to get rewards under the radar screen is via perks.

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Makers of the little black boxes, which alert drivers to the presence of police radar and help them avoid.

Community colleges can no longer fly under the radar.

Another way to get rewards under the radar screen is via perks.

Doppler radar can detect strong rotation within a storm, information useful in predicting the likelihood of a tornado.

Radar gun emits a continuous stream of microwaves at a preset frequency.

Morse code and sonar pings emanate from the radar room.

Law enforcement is on the counterattack, designing robots with radar to hunt underground for dope haulers operating there.

The invention combines a radar detector, police scanner and citizens.

Radar is enamored by a woman who is an intellectual.

Radar works by recording radio waves that have been reflected from the object under observation.

Jordan still flies under the radar of many travelers today, conjuring a sense of isolation and wonder.

I've heard that the police are now using lasers in addition to radar to catch speeders on the highway.

By using an amplifier device, they're able to push radar waves through walls up to eight inches thick.

Radar typically is used to keep track of larger objects, such as airplanes.

Inc, whose work was considered fundamental in the development of radar and nuclear.

The controllers' radar only shows planes' approximate positions, so they must space them well apart.

Scientists who track tornadoes in radar trucks often drive hundreds of miles a day without encountering any major storms.

Marshalling everything from major radar facilities to backyard telescopes, astronomers are gearing up for a fantastic view.

Marshosaurus was not a new dinosaur that had slipped under my radar.

The radar-responsive tag stays asleep until it is awakened by a radar pulse.

Two recent events on the radar screens of philosophers stirred long looks in the rearview mirror.

They also generate a lot of the radar reflections that designers of stealthy aircraft wish to eliminate.

One of the two privates on duty looks at the radar oscilloscope and can.

The prospect of terrorism using technology such as dirty bombs and biowarfare looms large on everybody's radar.

It must have a built-in radar or sonar beam to get it to a safe landing.

Scientists strap radar rigs onto honeybees to test a theory about the buzzing insects' bizarre method of communication.

Then a new radar detector would come out to help drivers evade it.

But a tendency to think of other men first will be amplified if talented women don't stay on the radar.

Surface-penetrating radar reveals features composed of ice, not rock.

Smooth curves and angled edges used to redirect radar waves have become the telltale features of stealth design ever since.

Surviving till the next week is the only thing on the radar.

Some of these systems use radar to keep a car at a set distance from the one in front.

Features of the station show up as bright areas in the radar image.

Some stories are too cool to let slide even if they don't make the radar of the day's top entertainment stories.

So, they'll need to have you on their radar screen before that if you're to have a chance at teaching for them next summer.

Many small firms operate under the radar of officialdom, dodging taxes and ignoring rules to survive.

Radar uses radio waves to enable aircraft, ships and ground stations to see far into their surroundings even at night and.

Telltale's episodic videogame plops the homicidal rabbit and his canine pal back on the pop culture radar.

Paying for housing costs isn't even on our radar screen.

British police have started lending radar equipment to residents' groups.

For that purpose you better shoul use deep soil radar sensors.

Goodbar he kept in his pocket had melted from the heat emitted from his active radar set.

We know many doctoral students who have worked under the radar to get some experience.

But flying under the radar was yet another increase to airline ticket prices.

For soldiers in the field, that warning may come from radar.

Also in the early days, there was no radar to keep track of flights.

But so far, part-time adjuncts have generally been off its radar screen.

Jobs in sectors that were barely on schools' radar ten years ago, such as private equity or real estate, are now demanded.

Wildlife that once existed under the radar suffers from sudden visibility and faddish appeal.

Maybe they're actually producing stellar art that has not hit your radar yet.

But even the new satellite-based radar images still need fine-tuning.

The publics have an equally serious problems, but they are not on the radar screen this year.

The gist is that ash clouds of dangerous density are hard to find, with radar or visual.

COLLAPSE

Collins

World English Dictionary

radar (ˈreɪdɑː)

—n
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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

radar

1941, acronym (more or less) for radio detecting and ranging. The U.S. choice, it won out over British radiolocation.

American Heritage

Science Dictionary

radar (rā'där) Pronunciation Key

(click for larger image in new window)

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.
The equipment used in such detecting. See also Doppler effect , lidar , sonar.

American Heritage

Cultural Dictionary

radar definition

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 radio detection and ranging.

Note: Police use radar techniques to determine the speed of automobiles.

American Heritage

Abbreviations & Acronyms

radar
radio detecting and ranging

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