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
The ranch also has an infrared sauna, one of the most satisfying places to spend a few minutes after a grueling hike.
—
Jessica Cherner, Architectural Digest, 13 Aug. 2025
One of its instruments is designed to detect exactly the kind of infrared light that would come from a temperate planet.
—Nell Greenfieldboyce, NPR, 7 Aug. 2025
The predatory insects employ thermal, or infrared, vision.
—Lauren Kim, CNN Money, 30 July 2025
The 6,500-square-foot three-story contemporary is minimalist in decor but teeming with superfluities, including an elevator, a first-floor gym, a screening room, an infrared sauna and a master-bedroom walk-in closet bigger (and tidier) than my SoHo apartment.
—Tatiana Siegel, Variety, 29 July 2025
See All Example Sentences for infrared
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Jessica Cherner, Architectural Digest, 13 Aug. 2025
One of its instruments is designed to detect exactly the kind of infrared light that would come from a temperate planet.
—Nell Greenfieldboyce, NPR, 7 Aug. 2025
The predatory insects employ thermal, or infrared, vision.
—Lauren Kim, CNN Money, 30 July 2025
The 6,500-square-foot three-story contemporary is minimalist in decor but teeming with superfluities, including an elevator, a first-floor gym, a screening room, an infrared sauna and a master-bedroom walk-in closet bigger (and tidier) than my SoHo apartment.
—Tatiana Siegel, Variety, 29 July 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 20 Aug. 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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