often attributive
1
: a device or system consisting usually of a synchronized radio transmitter and receiver that emits radio waves and processes their reflections for display and is used especially for detecting and locating objects (such as aircraft) or surface features (as of a planet)
2
: range of notice
fell off the radar after losing their first three games
Examples of radar in a Sentence
The approaching planes were detected by radar.
Recent Examples on the Web
How active protection systems work An APS integrates radar, electro-optical and infra-red (EO/IR) sensors, a fire control processor, and a countermeasure launcher into a single defensive suite mounted on an armored vehicle.
—
Aditya Jadhav, Interesting Engineering, 28 May 2026
The military maintains an integrated network of surface-to-air missiles, radar systems and anti-aircraft guns, centered on Soviet-era S-125 Pechora SA-3 missile batteries.
—Antonio María Delgado, Miami Herald, 28 May 2026
The updating radar map above shows current areas of precipitation in green, with greater intensities indicated by yellow and orange.
—Bay Area News Group, Mercury News, 28 May 2026
Brilliant, under-the-radar creators are scattered across the internet, buried by algorithms on crowded social media feeds and niche digital marketplaces.
—Arthur Zaczkiewicz, Footwear News, 27 May 2026
See All Example Sentences for radar
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Aditya Jadhav, Interesting Engineering, 28 May 2026
The military maintains an integrated network of surface-to-air missiles, radar systems and anti-aircraft guns, centered on Soviet-era S-125 Pechora SA-3 missile batteries.
—Antonio María Delgado, Miami Herald, 28 May 2026
The updating radar map above shows current areas of precipitation in green, with greater intensities indicated by yellow and orange.
—Bay Area News Group, Mercury News, 28 May 2026
Brilliant, under-the-radar creators are scattered across the internet, buried by algorithms on crowded social media feeds and niche digital marketplaces.
—Arthur Zaczkiewicz, Footwear News, 27 May 2026
See All Example Sentences for radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 29 May. 2026.
Copy CitationKids Definition
radar
noun
ra·dar
ˈrā-ˌdär 
: a device that sends out radio waves for detecting and locating an object by the reflection of the radio waves and that may use this reflection to find out the position and speed of the object
Etymology
from radio detecting and ranging
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