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
Bright red lava flows stand out starkly against the vivid green vegetation of the surrounding landscape, made more vibrant by combining visible light observations with infrared imagery.
—
Brett Tingley, Space.com, 13 Mar. 2026
Some drones also are equipped with infrared systems.
—Don Sweeney, Sacbee.com, 12 Mar. 2026
The top layer is a long-range detection network linked with Thales Alenia Space geostationary satellites, which monitor infrared signatures associated with missile launches.
—David Szondy
march 12, New Atlas, 12 Mar. 2026
Sprawling galaxies and cosmic structures that expand for light-years have often been the focus of the observatory’s infrared gaze, but so have distant, faint objects.
—Ashley Strickland, CNN Money, 10 Mar. 2026
See All Example Sentences for infrared
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Brett Tingley, Space.com, 13 Mar. 2026
Some drones also are equipped with infrared systems.
—Don Sweeney, Sacbee.com, 12 Mar. 2026
The top layer is a long-range detection network linked with Thales Alenia Space geostationary satellites, which monitor infrared signatures associated with missile launches.
—David Szondy
march 12, New Atlas, 12 Mar. 2026
Sprawling galaxies and cosmic structures that expand for light-years have often been the focus of the observatory’s infrared gaze, but so have distant, faint objects.
—Ashley Strickland, CNN Money, 10 Mar. 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 15 Mar. 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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