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
This under-the-radar section is packed with kitchenware, home decor, gardening tools, and more that make great presents for everyone on your list.
—
Shea Simmons, Southern Living, 6 Dec. 2025
But while their skin-care innovations have long earned praise, their LED Hair Growth Helmet is the brand’s under-the-radar masterpiece.
—Polly Blitzer, Allure, 6 Dec. 2025
That said, the most likely reasons include operations such as radar coverage mapping, electronic countermeasures testing, or probing French response times by a foreign state.
—Christopher McFadden, Interesting Engineering, 6 Dec. 2025
Two sea planes took off that night in search of Flight 19, though one of those flying boats also vanished from radar, and its 13-member crew went missing.
—Lorenzino Estrada, AZCentral.com, 5 Dec. 2025
See All Example Sentences for radar
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Shea Simmons, Southern Living, 6 Dec. 2025
But while their skin-care innovations have long earned praise, their LED Hair Growth Helmet is the brand’s under-the-radar masterpiece.
—Polly Blitzer, Allure, 6 Dec. 2025
That said, the most likely reasons include operations such as radar coverage mapping, electronic countermeasures testing, or probing French response times by a foreign state.
—Christopher McFadden, Interesting Engineering, 6 Dec. 2025
Two sea planes took off that night in search of Flight 19, though one of those flying boats also vanished from radar, and its 13-member crew went missing.
—Lorenzino Estrada, AZCentral.com, 5 Dec. 2025
See All Example Sentences for radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 7 Dec. 2025.
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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