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 blurriness in Webb's API images was traced to electronic distortions arising on Webb's infrared camera detector.
—
Tereza Pultarova, Space.com, 5 Nov. 2025
These infrared pulses typically require additional metal filters, which eat up valuable energy.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
Guests can expect amenities like complimentary in-room refreshments, a game room stocked with billiards tables and classic board games, and a modern fitness center equipped with infrared saunas.
—Cat Sposato, Travel + Leisure, 4 Nov. 2025
Using active binocular infrared imaging technology, and a RGB camera, the robot vacuum can create 3D models in real time to identify obstacles—even in the dark.
—Terri Williams, Architectural Digest, 3 Nov. 2025
See All Example Sentences for infrared
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Tereza Pultarova, Space.com, 5 Nov. 2025
These infrared pulses typically require additional metal filters, which eat up valuable energy.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
Guests can expect amenities like complimentary in-room refreshments, a game room stocked with billiards tables and classic board games, and a modern fitness center equipped with infrared saunas.
—Cat Sposato, Travel + Leisure, 4 Nov. 2025
Using active binocular infrared imaging technology, and a RGB camera, the robot vacuum can create 3D models in real time to identify obstacles—even in the dark.
—Terri Williams, Architectural Digest, 3 Nov. 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 8 Nov. 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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