What does "infrared radiation" mean?

Electromagnetic radiation having a wavelength approximately between 1 micrometre and 1 millimetre; perceived as heat.

Infrared radiation

Common synonyms include: heat energy, heat radiation, infrared, infrared emission, infrared imaging, infrared light.

noun

noun ·Rare ·Advanced level

Noun

1
Electromagnetic radiation having a wavelength approximately between 1 micrometre and 1 millimetre; perceived as heat. uncountable
2
electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves wordnet