infrared

adjective

in·​fra·​red ˌin-frə-ˈred How to pronounce infrared (audio)
-(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 There is no safe dose of solar ultraviolet rays or infrared radiation, says Dr. Yehia Hashad, an ophthalmologist, retinal specialist and the chief medical officer at eye health company Bausch + Lomb. Aliza Chasan, CBS News, 8 Apr. 2024 Compared to regular sunglasses, proper eclipse glasses are 100,000 times darker to block nearly all visible, infrared and ultraviolet light and protect our sensitive retinas when looking skyward. Eric Lagatta, USA TODAY, 8 Apr. 2024 These glasses reduce visible sunlight to safe and comfortable levels and block all but a tiny fraction of solar UV and infrared radiation, according to the American Astronomical Society. Karen Garcia, Los Angeles Times, 4 Apr. 2024 Neither simple radiant heat—infrared light—nor convective heat, like the bubbling churn of hot fluids, can pump enough energy into the corona to explain its high temperature. Popsci Staff, Popular Science, 27 Mar. 2024 This full spectrum technology enables deep infrared heat penetration, doubled with high output heaters that boast superior wattage and supplemental Halogen heaters that swiftly raise temperatures. Variety Staff, Variety, 29 Mar. 2024 But not all that long ago, those same dire circumstances described the James Webb Space Telescope, the pioneering infrared scope that launched on Christmas Day 2021. Tribune News Service, The Mercury News, 29 Mar. 2024 That said, infrared features—which use metal or ceramic materials to direct heat more efficiently and effectively—can make up for lower BTUs. Emily Farris, Bon Appétit, 28 Mar. 2024 Equipped with special lenses that filter out most of the sun’s light, particularly the ultraviolet and infrared rays, this gazing gear provides adequate visual protection to allow for direct viewing. Max Bennett, Discover Magazine, 26 Mar. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'infrared.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1881, in the meaning defined at sense 1

Time Traveler
The first known use of infrared was in 1881

Dictionary Entries Near infrared

Cite this Entry

“Infrared.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/infrared. Accessed 17 Apr. 2024.

Kids Definition

infrared

adjective
in·​fra·​red ˌin-frə-ˈred How to pronounce infrared (audio)
-(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 How to pronounce infrared (audio)
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

More from Merriam-Webster on infrared

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