Definition of infrared
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
nounExplore Merriam-Webster
1881
First Known Use of infrared
1881
INFRARED Defined for English Language Learners
infrared
playDefinition of infrared for English Language Learners
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: producing or using rays of light that cannot be seen and that are longer than rays that produce red light
INFRARED Defined for Kids
infrared
playDefinition of infrared for Students
: being, relating to, or producing rays like light but lying outside the visible spectrum at its red end
Medical Dictionary
Medical Definition of infrared
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
Medical Definition of infrared
: infrared radiation
Learn More about infrared
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See words that rhyme with infrared Spanish Central: Translation of infrared Nglish: Translation of infrared for Spanish speakers
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