(uncountable) The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm.

Having a wavelength in the infrared spectrum.

plural of infrared

A literary movement of the 1970s, founded in Mexico by poet Mario Santiago Papasquiaro and Chilean novelist Roberto Bolaño.

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

(physics) infrared light closest in wavelength to visible light, from .7 - 1.4 µm.

(analytical chemistry) The spectroscopic study of the interaction of matter with infrared radiation; used as an analytical tool to identify (mostly organic) compounds.

An incandescent lamp designed to produce radiant thermal energy in the infrared part of the electromagnetic spectrum.

(astronomy) the astronomical observation and study of objects, cooler than most stars, using the infrared part of the electromagnetic spectrum

The estimation of surface temperatures by analysing the emitted infrared radiation