| Library / English Dictionary |
RADAR
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
Measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
Synonyms:
microwave radar; radar; radio detection and ranging; radiolocation
Classified under:
Nouns denoting man-made objects
Hypernyms ("radar" is a kind of...):
measuring device; measuring instrument; measuring system (instrument that shows the extent or amount or quantity or degree of something)
Meronyms (parts of "radar"):
dish; dish aerial; dish antenna; saucer (directional antenna consisting of a parabolic reflector for microwave or radio frequency radiation)
cathode-ray oscilloscope; CRO; oscilloscope; scope (electronic equipment that provides visual images of varying electrical quantities)
pulse generator (a generator of single or multiple voltage pulses; usually adjustable for pulse rate)
wave guide; waveguide (a hollow metal conductor that provides a path to guide microwaves; used in radar)
Hyponyms (each of the following is a kind of "radar"):
Doppler radar (radar that uses the Doppler shift to measure velocity)
early warning radar (a radar that is part of an early warning system)
3d radar; three-dimensional radar (radar that will report altitude as well as azimuth and distance of a target)
weather radar (radar that is able to detect clouds and precipitation)
Context examples:
The device called FINDER (Finding Individuals for Disaster and Emergency Response) uses microwave-radar technology to detect heartbeats of victims trapped in wreckage.
(DHS and NASA Technology Helps Save Four in Nepal Earthquake Disaster, The Titi Tudorancea Bulletin)
In 2007, radar observations made from Earth revealed small shifts in the spin of Mercury, called librations, that proved some of Mercury’s core must be liquid-molten metal.
(A Closer Look at Mercury’s Spin and Gravity Reveals the Planet’s Inner Solid Core, NASA)
Specifically, they used data from Cassini's radar imager to penetrate Titan's opaque atmosphere of nitrogen and methane.
(The First Global Geologic Map of Titan Completed, NASA)
Using radar data from NASA's Cassini spacecraft, recently published research presents a new scenario to explain why some methane-filled lakes on Saturn's moon Titan are surrounded by steep rims that reach hundreds of feet high.
(New Models Suggest Titan Lakes Are Explosion Craters, NASA)
The radar images confirmed the asteroid rotates once every 2.4 hours.
(Biggest Asteroid Ever Detected Flies Past Earth, The Titi Tudorancea Bulletin)
The branching channels appear dark in radar images, much like Titan's methane-rich seas.
(Cassini Finds Flooded Canyons on Titan, NASA)
MacGregor studied the raw radar images that are used to map the topography of the bedrock beneath the ice, including those collected by NASA’s Operation IceBridge.
(NASA Finds Possible Second Impact Crater Under Greenland Ice, NASA)
Florence is expected to be an excellent target for ground-based radar observations.
(Large Asteroid to Safely Pass Earth on Sept. 1, NASA)
Previous observations of the poles of Mercury with Earth-based radar revealed a signature characteristic of thick, pure ice deposits.
(The Moon and Mercury May Have Thick Ice Deposits, NASA)
There are several days to keep on your radar that show great possibility for romance—single or attached, these days look quite divine.
(AstrologyZone.com, by Susan Miller)
