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infrared radiation

Cultural  
  1. 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.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

These glasses reduce visible sunlight to safe and comfortable levels and block all but a tiny fraction of solar UV and infrared radiation, according to the American Astronomical Society.

From Los Angeles Times • Apr. 4, 2024

In the process, the dust also heats up, producing infrared radiation that is detectable.

From Science Daily • Jan. 29, 2024

Like any hot object, it was giving off radiant heat -- what we’d now call long-wave infrared radiation.

From Scientific American • Nov. 9, 2023

Germanium is mainly used in fibre optics and plastics as well as infrared radiation.

From Reuters • Jul. 4, 2023

Some nearby examples, tens or hundreds of millions of light-years away, are powerful sources of X-rays, infrared radiation and radio waves, have extremely luminous cores and fluctuate in brightness on time scales of weeks.

From "Cosmos" by Carl Sagan

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