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 device specifically employs 14 dual-chip LED lights of both red light and near infrared light.
—
Emily Burns, Footwear News, 2 June 2025
Carbon dioxide and water are excellent absorbers of infrared light, preventing astronomers on the ground from seeing most of those emissions from cosmic objects, too.
—Phil Plait, Scientific American, 29 May 2025
Their new material is designed to evade both microwave and infrared detection technologies widely used in modern military surveillance, even when exposed to extremely high temperatures, as reported by the South China Morning Post.
—Micah McCartney, MSNBC Newsweek, 28 May 2025
In previous research, some of the same scientists gave mice infrared vision by injecting the nanoparticles directly into their eyes.
—Margherita Bassi, Smithsonian Magazine, 27 May 2025
See All Example Sentences for infrared
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Emily Burns, Footwear News, 2 June 2025
Carbon dioxide and water are excellent absorbers of infrared light, preventing astronomers on the ground from seeing most of those emissions from cosmic objects, too.
—Phil Plait, Scientific American, 29 May 2025
Their new material is designed to evade both microwave and infrared detection technologies widely used in modern military surveillance, even when exposed to extremely high temperatures, as reported by the South China Morning Post.
—Micah McCartney, MSNBC Newsweek, 28 May 2025
In previous research, some of the same scientists gave mice infrared vision by injecting the nanoparticles directly into their eyes.
—Margherita Bassi, Smithsonian Magazine, 27 May 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 Jun. 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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