infrared Meaning, Definition & Usage

1. noun the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
   infrared frequency.
   
   • they could sense radiation in the infrared
2. noun electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
   infrared light; infrared radiation; infrared emission.
   
3. adjective satellite having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end
   
   • infrared radiation
   • infrared photography

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