infrared
adjective
in·fra·red
ˌin-frə-ˈred 
-(ˌ)frä-,
-fə-
1
: situated outside the visible spectrum at its red end
—used of radiation having a wavelength between about 700 nanometers and 1 millimeter
2
: relating to, producing, or employing infrared radiation
infrared therapy
3
: sensitive to infrared radiation
infrared sensors that detect body heat
infrared
noun
Examples of infrared in a Sentence
Recent Examples on the Web
Combining four medical-grade technologies — radio frequency, infrared therapy, targeted LED light, and heat therapy — this handheld device promises to deliver professional-level results at home.
—
Angela Lei, Forbes.com, 4 Apr. 2025
In 2023, the James Webb Space Telescope (JWST) provided astronomers with the first infrared data of this stellar nursery, enabling them to peer through the obscuring blanket of gas and dust and study its young stellar population in greater detail.
—Sharmila Kuthunur, Space.com, 3 Apr. 2025
New infrared observations indicate that the asteroid measures between 174 feet and 220 feet in diameter -- about the size of the 10-story building, according to NASA.
—Julia Jacobo, ABC News, 3 Apr. 2025
The satellites are fitted with custom six-band, multispectral infrared cameras designed to capture imagery suitable for machine learning algorithms to accurately identify wildfires, differentiating them from misleading objects like smokestacks.
—Kurt Knutsson, Cyberguy Report, FOXNews.com, 2 Apr. 2025
See All Example Sentences for infrared
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Angela Lei, Forbes.com, 4 Apr. 2025
In 2023, the James Webb Space Telescope (JWST) provided astronomers with the first infrared data of this stellar nursery, enabling them to peer through the obscuring blanket of gas and dust and study its young stellar population in greater detail.
—Sharmila Kuthunur, Space.com, 3 Apr. 2025
New infrared observations indicate that the asteroid measures between 174 feet and 220 feet in diameter -- about the size of the 10-story building, according to NASA.
—Julia Jacobo, ABC News, 3 Apr. 2025
The satellites are fitted with custom six-band, multispectral infrared cameras designed to capture imagery suitable for machine learning algorithms to accurately identify wildfires, differentiating them from misleading objects like smokestacks.
—Kurt Knutsson, Cyberguy Report, FOXNews.com, 2 Apr. 2025
See All Example Sentences for infrared
Cite this Entry
“Infrared.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infrared. Accessed 10 Apr. 2025.
Copy CitationKids Definition
infrared
adjective
in·fra·red
ˌin-frə-ˈred
-(ˌ)frä-
: being, relating to, producing, or using rays like light but lying outside the visible spectrum at its red end
infrared radiation
infrared
noun
Medical Definition
infrared
1 of 2 adjective
in·fra·red
ˌin-frə-ˈred
1
: lying outside the visible spectrum at its red end
—used of radiation having a wavelength between about 700 nanometers and 1 millimeter
2
: relating to, producing, or employing infrared radiation
infrared therapy
infrared
2 of 2 noun
: infrared radiation
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