It means they're below red. Refers to colors that are in the spectrum below that color and correspond to a longer wavelength than visible light in electromagnetic radiation. Infrared rays are invisible to the human eye.
furoya
Infrared plural error.
Isabel Arriaga
Incorrectly written when going with double r , that is, the correct word is infrared. Infrared or infrared light is electromagnetic radiation of greater wavelength than visible light but less than those of microwaves.
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