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
Biometric support comes from a fingerprint reader in the power button and an infrared webcam.
—
PCMAG, 16 Mar. 2025
The nearly 12-foot optical and infrared telescope is one of the largest in the world.
—Greta Cross, USA TODAY, 12 Mar. 2025
In space, however, infrared light from stars, galaxies and other celestial objects carries key information about their composition, density, temperature and chemical makeup.
—Denise Chow, NBC News, 12 Mar. 2025
The telescope's infrared detectors will be able to distinguish 102 colors invisible to the human eye, yielding the most colorful, inclusive map ever made of the cosmos.
—CBS News, 11 Mar. 2025
See All Example Sentences for infrared
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PCMAG, 16 Mar. 2025
The nearly 12-foot optical and infrared telescope is one of the largest in the world.
—Greta Cross, USA TODAY, 12 Mar. 2025
In space, however, infrared light from stars, galaxies and other celestial objects carries key information about their composition, density, temperature and chemical makeup.
—Denise Chow, NBC News, 12 Mar. 2025
The telescope's infrared detectors will be able to distinguish 102 colors invisible to the human eye, yielding the most colorful, inclusive map ever made of the cosmos.
—CBS News, 11 Mar. 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 26 Mar. 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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