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
Other companies, such as BlackSky and Maxar, are providing their own electro-optical/infrared (EO/IR) imagery—that is, images in the visible and infrared light spectrums—commercially.
—
Literary Hub, 28 Oct. 2025
The glasses capture images and send them as near-infrared light to the implant.
—Kurt Knutsson, FOXNews.com, 28 Oct. 2025
This mask uses four light wavelengths—amber (605nm), red (630nm), deep red (660nm), and infrared (880nm)—to target wrinkles around the eye area in just three minutes.
—Deanna Pai, Vogue, 27 Oct. 2025
The improvements in that technology transferred to the health industry, enabling smaller, less expensive infrared devices for a number of medical applications such as handheld ear thermometers used at home and sophisticated instruments used to detect cancers.
—Michele Raphael, USA Today, 24 Oct. 2025
See All Example Sentences for infrared
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Literary Hub, 28 Oct. 2025
The glasses capture images and send them as near-infrared light to the implant.
—Kurt Knutsson, FOXNews.com, 28 Oct. 2025
This mask uses four light wavelengths—amber (605nm), red (630nm), deep red (660nm), and infrared (880nm)—to target wrinkles around the eye area in just three minutes.
—Deanna Pai, Vogue, 27 Oct. 2025
The improvements in that technology transferred to the health industry, enabling smaller, less expensive infrared devices for a number of medical applications such as handheld ear thermometers used at home and sophisticated instruments used to detect cancers.
—Michele Raphael, USA Today, 24 Oct. 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 31 Oct. 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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