infrared

[in-fruh-red]
noun
1.
the part of the invisible spectrum that is contiguous to the red end of the visible spectrum and that comprises electromagnetic radiation of wavelengths from 800 nm to 1 mm.
adjective
2.
noting or pertaining to the infrared or its component rays: infrared radiation.
Also, infra-red.
Compare ultraviolet.


Origin:
1825–35; infra- + red1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
infrared (ˌɪnfrəˈrɛd)
 
n
1.  the part of the electromagnetic spectrum with a longer wavelength than light but a shorter wavelength than radio waves; radiation with wavelength between 0.8 micrometres and 1 millimetre
 
adj
2.  of, relating to, using, or consisting of radiation lying within the infrared: infrared radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

infrared in·fra·red (ĭn'frə-rěd')
adj.

  1. Of or relating to the range of invisible radiation wavelengths from about 750 nanometers, just longer than red in the visible spectrum, to 1 millimeter, on the border of the microwave region.

  2. Generating, using, or sensitive to infrared radiation.

n.
Infrared light or the infrared part of the spectrum.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
infrared   (ĭn'frə-rěd')  Pronunciation Key 
Relating to the invisible part of the electromagnetic spectrum with wavelengths longer than those of visible red light but shorter than those of microwaves. See more at electromagnetic spectrum.

Our Living Language  : In 1800 the astronomer Sir William Herschel discovered infrared light while exploring the relationship between heat and light. Herschel used a prism to split a beam of sunlight into a spectrum and then placed a thermometer in each of the bands of light. When he placed the thermometer just outside the red band, where there was no visible color, the temperature rose, as if light were shining on the thermometer. Further experiment showed that this invisible radiation behaved like visible light in many ways; for example, it could be reflected by a mirror. Infrared radiation is simply electromagnetic radiation with a lower frequency than visible light, having longer wavelengths of 0.7 micrometer to 1 millimeter. Ultraviolet radiation, like infrared radiation, lies just outside the visible part of the spectrum, but with higher frequencies; some animals, such as bees, are capable of seeing such radiation. Both infrared and ultraviolet radiation are often referred to as forms of light, though they cannot be seen by human beings. Heat energy is often transferred in the form of infrared radiation, which is given off from an object as a result of molecular collisions within it. Molecules typically have a characteristic infrared absorption spectrum, and infrared spectroscopy is a common technique for identifying the molecular structure of substances. Astronomers similarly analyze the infrared radiation emitted by celestial bodies to determine their temperature and composition.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

infrared definition

electronics
(IR) Electromagnetic waves in the frequency range just below visible light corresponding to radiated heat. IR waves can be generated by a kind of LED and are often used for remote controls for televisions etc. and in some docking stations.
(1997-01-30)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
It is replaced by rays of infrared light spreading throughout the room.
Surface measurements find more downward infrared radiation warming the planet's
  surface.
Because rattlesnakes can sense infrared radiation, a hot tail makes the ground
  squirrel look even bigger.
They've got an infrared heat lamp to keep them toasty as they grow, and they've
  gotten lots of visitors today.
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