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
The under-the-radar section is packed with last-chance deals that are leaving the site and seriously marked down to sell quickly.
—
Shea Simmons, Southern Living, 27 Dec. 2025
These include structures consistent with missile launch units, radar arrays, and defensive equipment typically found on warships.
—Prabhat Ranjan Mishra, Interesting Engineering, 27 Dec. 2025
But over the last week, Nebraska transfer Dylan Raiola has reportedly drifted from Tech’s radar, and Cincinnati’s Brendan Sorsby has drawn interest from Tennessee.
—Noah White, Miami Herald, 26 Dec. 2025
The trucking brokerage tasked with the delivery, Rexing Companies, first raised the alarm after the shipment vanished from radar, with no sign of delivery or lawful diversion.
—Moná Thomas, PEOPLE, 26 Dec. 2025
See All Example Sentences for radar
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Shea Simmons, Southern Living, 27 Dec. 2025
These include structures consistent with missile launch units, radar arrays, and defensive equipment typically found on warships.
—Prabhat Ranjan Mishra, Interesting Engineering, 27 Dec. 2025
But over the last week, Nebraska transfer Dylan Raiola has reportedly drifted from Tech’s radar, and Cincinnati’s Brendan Sorsby has drawn interest from Tennessee.
—Noah White, Miami Herald, 26 Dec. 2025
The trucking brokerage tasked with the delivery, Rexing Companies, first raised the alarm after the shipment vanished from radar, with no sign of delivery or lawful diversion.
—Moná Thomas, PEOPLE, 26 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 28 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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