infrared radiation

Cultural

Invisible radiation in the part of the electromagnetic spectrum characterized by wavelengths just longer than those of ordinary visible red light and shorter than those of microwaves or radio waves. (Compare ultraviolet radiation.)

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The heat we feel from a glowing coal or an incandescent light bulb is from infrared rays.

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infrared radiation

An asteroid absorbs sunlight and later releases that energy as infrared radiation.

From Science Daily ● Jul. 18, 2026

The heat has to leave as infrared radiation, which is a relatively slow process.

From Science Daily ● Jun. 19, 2026

Their high temperatures allow them to emit detectable infrared radiation.

From Science Daily ● Jun. 1, 2026

To identify the disk gases, the team used MIRI's spectrograph to decompose the infrared radiation received from the disk into signatures of small wavelength ranges -- similar to sunlight being split into a rainbow.

From Science Daily ● Jun. 6, 2024

Rattlesnakes and doped semiconductors detect infrared radiation perfectly well.

From "Cosmos" by Carl Sagan

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023