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
Murden says that Higher Dose’s infrared sauna blanket helps her detox while lying in bed, and gives her the best sweat she’s ever seen.
—
Kiana Murden, Vogue, 1 Aug. 2025
Heat-sensing pits: Located between the eyes and nostrils, these pits detect infrared radiation (heat) from prey or predators.
—Brandi D. Addison, Austin American Statesman, 31 July 2025
In particular, the ionization of neon causes the release of infrared radiation at a very specific wavelength.
—Robert Lea, Space.com, 29 July 2025
The new theater — spanning 20,000 square feet, more than double the footprint of the former Doris Duke Theatre — includes a spatial audio system, infrared cameras to track performers for interactive video content and giant screens that double as kinetic canvases, among other high-tech flourishes.
—Leslie Katz, Forbes.com, 27 July 2025
See All Example Sentences for infrared
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Kiana Murden, Vogue, 1 Aug. 2025
Heat-sensing pits: Located between the eyes and nostrils, these pits detect infrared radiation (heat) from prey or predators.
—Brandi D. Addison, Austin American Statesman, 31 July 2025
In particular, the ionization of neon causes the release of infrared radiation at a very specific wavelength.
—Robert Lea, Space.com, 29 July 2025
The new theater — spanning 20,000 square feet, more than double the footprint of the former Doris Duke Theatre — includes a spatial audio system, infrared cameras to track performers for interactive video content and giant screens that double as kinetic canvases, among other high-tech flourishes.
—Leslie Katz, Forbes.com, 27 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 6 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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