infrared

Adjective

• 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
    

Noun

• electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

• the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
  • they could sense radiation in the infrared
    

Related words

• Synonyms: 
  infrared light , infrared radiation , infrared emission , infrared frequency