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
Consider Thursday a blip on the radar for the rolling Braves.
—
Gabriel Burns, AJC.com, 15 May 2026
At a restaurant best known for biscuits, gravy, and rocking chairs on the front porch, the catfish plate may still fly under the radar.
—Jessica Safavimehr, Southern Living, 14 May 2026
Emergency protocols were activated once communication and radar contact were lost with the plane, the county said, adding that authorities then received reports of the missing craft and a fire in the Capitan Mountains.
—David Chiu, PEOPLE, 14 May 2026
The Under-the-radar Food Town Worth Knowing El Paso, Texas, surprised Lakshmi, who spent time tracing the city’s deep, daily connection with Juárez, Mexico—a back-and-forth that shapes the food supply, the culture, and the rhythms of daily life on both sides of the border.
—Regan Stephens, Travel + Leisure, 14 May 2026
See All Example Sentences for radar
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Gabriel Burns, AJC.com, 15 May 2026
At a restaurant best known for biscuits, gravy, and rocking chairs on the front porch, the catfish plate may still fly under the radar.
—Jessica Safavimehr, Southern Living, 14 May 2026
Emergency protocols were activated once communication and radar contact were lost with the plane, the county said, adding that authorities then received reports of the missing craft and a fire in the Capitan Mountains.
—David Chiu, PEOPLE, 14 May 2026
The Under-the-radar Food Town Worth Knowing El Paso, Texas, surprised Lakshmi, who spent time tracing the city’s deep, daily connection with Juárez, Mexico—a back-and-forth that shapes the food supply, the culture, and the rhythms of daily life on both sides of the border.
—Regan Stephens, Travel + Leisure, 14 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 18 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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