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 global metals company Umicore recycles germanium from manufacturing scrap, fiber optic cables, solar cells, and infrared optical devices at an optical materials facility in Quapaw, Oklahoma, as well as in Belgium.
—
Maddie Stone, WIRED, 15 Feb. 2025
The far infrared heat penetrates the hair shaft, ensuring a speedy dry while minimizing damage that can cause dehydration and frizz.
—Brigitt Earley, Glamour, 14 Feb. 2025
Key Features and Cost One of the system's key advantages is its passive infrared guidance, which eliminates the need for radar emissions that could expose its location to enemy forces.
—Josh Hammer, Newsweek, 14 Feb. 2025
The $10 billion observatory was designed to perceive a broader range of light from the infrared spectrum and has four main instruments in its Integrated Science Instrument Module, or ISIM.
—Stephen J. Beard, USA TODAY, 14 Feb. 2025
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Maddie Stone, WIRED, 15 Feb. 2025
The far infrared heat penetrates the hair shaft, ensuring a speedy dry while minimizing damage that can cause dehydration and frizz.
—Brigitt Earley, Glamour, 14 Feb. 2025
Key Features and Cost One of the system's key advantages is its passive infrared guidance, which eliminates the need for radar emissions that could expose its location to enemy forces.
—Josh Hammer, Newsweek, 14 Feb. 2025
The $10 billion observatory was designed to perceive a broader range of light from the infrared spectrum and has four main instruments in its Integrated Science Instrument Module, or ISIM.
—Stephen J. Beard, USA TODAY, 14 Feb. 2025
See all Example Sentences for infrared
Dictionary Entries Near infrared
Cite this Entry
“Infrared.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infrared. Accessed 20 Feb. 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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