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
Joshua Tree regulars and High Desert devotees would be wise to keep it on their radar and be on the lookout for any updates and upgrades.
—
Condé Nast, Condé Nast Traveler, 20 Feb. 2026
What's more, warehouses introduce new products every single month, giving shoppers a steady stream of limited-time finds, seasonal favorites, and under-the-radar gems that make every visit feel worth the trip.
—Kait Hanson, Southern Living, 20 Feb. 2026
These spotters report information to meteorologists, who examine radar data and other videos or photos sent to the NWS.
—Carol Kugler, IndyStar, 20 Feb. 2026
The missile is required to feature an advanced anti-radiation seeker with broad frequency coverage and the ability to counter modern, advanced radar systems.
—Jijo Malayil, Interesting Engineering, 20 Feb. 2026
See All Example Sentences for radar
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Condé Nast, Condé Nast Traveler, 20 Feb. 2026
What's more, warehouses introduce new products every single month, giving shoppers a steady stream of limited-time finds, seasonal favorites, and under-the-radar gems that make every visit feel worth the trip.
—Kait Hanson, Southern Living, 20 Feb. 2026
These spotters report information to meteorologists, who examine radar data and other videos or photos sent to the NWS.
—Carol Kugler, IndyStar, 20 Feb. 2026
The missile is required to feature an advanced anti-radiation seeker with broad frequency coverage and the ability to counter modern, advanced radar systems.
—Jijo Malayil, Interesting Engineering, 20 Feb. 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 21 Feb. 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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