|1.||[ 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"
|2.||[ noun ] (physics) the infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range|
"they could sense radiation in the infrared"
|Related terms:||frequency infrared_spectrum|
|3.||[ noun ] (physics) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves|
|Synonyms:||infrared_emission infrared_radiation infrared_light|