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
Jones’ portrayal of Stephen Hawking’s wife Jane in the love story-meets-biopic put her on Hollywood’s radar, leading to an Oscar nomination and studio roles.
—
Alex Ritman, Variety, 11 Dec. 2024
In order to cross public streets, the carts could also communicate with boxes at intersections with radars and a camera which could verify no other traffic was coming.
—Brad Templeton, Forbes, 9 Dec. 2024
Bose QuietComfort Bluetooth Headphones Another stellar deal that should be on your radar this week?
—Isabel Garcia, People.com, 6 Dec. 2024
And an alternative de-mining solution, underground radar, which emits high-frequency electromagnetic waves into the ground, has the disadvantage of being easily affected by the condition of the soil.
—Ritsuko Kawai, WIRED, 4 Dec. 2024
See all Example Sentences for radar 
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Alex Ritman, Variety, 11 Dec. 2024
In order to cross public streets, the carts could also communicate with boxes at intersections with radars and a camera which could verify no other traffic was coming.
—Brad Templeton, Forbes, 9 Dec. 2024
Bose QuietComfort Bluetooth Headphones Another stellar deal that should be on your radar this week?
—Isabel Garcia, People.com, 6 Dec. 2024
And an alternative de-mining solution, underground radar, which emits high-frequency electromagnetic waves into the ground, has the disadvantage of being easily affected by the condition of the soil.
—Ritsuko Kawai, WIRED, 4 Dec. 2024
See all Example Sentences for radar
Dictionary Entries Near radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 22 Dec. 2024.
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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