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
Investigators are also reportedly working to extract data from devices aboard the vessel – including an infrared camera – that may contain additional clues surrounding Lynette Hooker’s disappearance.
—
Julia Bonavita , Adam Sabes , Kelsie Cairns, FOXNews.com, 28 May 2026
Near-infrared light (700–1440 nm) goes deeper into the dermis layer of the skin.
—Jesse Pines, Forbes.com, 28 May 2026
Investigators have also been examining whether technology aboard the vessel, including an infrared camera, may hold evidence relevant to the case.
—Nicole Sganga, CBS News, 27 May 2026
The Fitbit Air uses an optical heart rate monitor, a three-axis accelerometer, a gyroscope, a temperature sensor, and red and infrared sensors for health tracking.
—Andrew Gebhart, PC Magazine, 27 May 2026
See All Example Sentences for infrared
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Julia Bonavita , Adam Sabes , Kelsie Cairns, FOXNews.com, 28 May 2026
Near-infrared light (700–1440 nm) goes deeper into the dermis layer of the skin.
—Jesse Pines, Forbes.com, 28 May 2026
Investigators have also been examining whether technology aboard the vessel, including an infrared camera, may hold evidence relevant to the case.
—Nicole Sganga, CBS News, 27 May 2026
The Fitbit Air uses an optical heart rate monitor, a three-axis accelerometer, a gyroscope, a temperature sensor, and red and infrared sensors for health tracking.
—Andrew Gebhart, PC Magazine, 27 May 2026
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 May. 2026.
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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