infrared

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adjective in·fra·red \ˌin-frə-ˈred, -(ˌ)frä-, -fə-\

Definition of infrared

  1. 1 :  situated outside the visible spectrum at its red end —used of radiation having a wavelength between about 700 nanometers and 1 millimeter

  2. 2 :  relating to, producing, or employing infrared radiation infrared therapy

  3. 3 :  sensitive to infrared radiation infrared sensors that detect body heat

infrared

noun

Recent Examples of infrared from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infrared'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of infrared

1881


INFRARED Defined for English Language Learners

infrared

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adjective

Definition of infrared for English Language Learners

  • : 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

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adjective in·fra·red \ˌin-frə-ˈred\

Definition of infrared for Students

  1. :  being, relating to, or producing rays like light but lying outside the visible spectrum at its red end


Medical Dictionary

1

infrared

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adjective in·fra·red \ˌin-frə-ˈred\

Medical Definition of infrared

  1. 1:  lying outside the visible spectrum at its red end—used of radiation having a wavelength between about 700 nanometers and 1 millimeter

  2. 2:  relating to, producing, or employing infrared radiation infrared therapy


2

infrared

noun in·fra·red

Medical Definition of infrared

  1. :  infrared radiation



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