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denoting electromagnetic radiation of wavelength greater than that of the red end of the spectrum, i.e., of 0.75–1000 μm. Infrared rays are sometimes subdivided into long-wave or far infrared (about 3.0–1000 μm) and short-wave or near infrared (about 0.75–3.0 μm). They are capable of penetrating body tissues to a depth of 1 cm. Sources of infrared rays include heat lamps, hot water bottles, steam radiators, and incandescent light bulbs. Infrared rays are used therapeutically to promote muscle relaxation, to speed up the inflammatory process, and to increase circulation to a part of the body. See also heat.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·fra·red (IR, ir),

That portion of the electromagnetic spectrum with wavelengths between 730 and 1000 nm.
Farlex Partner Medical Dictionary © Farlex 2012


That portion of the electromagnetic spectrum with wavelengths between 770-1000 nm.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


the electromagnetic radiation in the region between red light and radio waves. see ELECTROMAGNETIC SPECTRUM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

infrared (IR)

Radiant energy of wavelengths between the extreme red wavelengths of the visible spectrum and a wavelength of a few millimetres. The wave band comprising radiations between 780 and 1400 nm is referred to as IR-A. Excessive exposure to these radiations can cause visual loss (e.g. eclipse blindness) and cataract. The waveband comprising radiations between 1400 and 3000 nm is referred to as IR-B. Excessive exposure to these radiations can cause cataract and corneal opacity. The wave band comprising radiations between 3000 and 1 ✕ 106 nm (or 1 mm) is referred to as IR-C. Excessive exposure to these radiations can cause cataract (heat-ray cataract). See eclipse blindness; absorptive lens; infrared optometer.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
After making his 1982 CCD images, Reipurth searched for an infrared source near the nebula and found one that radiates infrared around 2 microns wavelength.
Then on May 26, 1996, Hrivnak and I were observing at the CFHT when we turned the telescope to IRAS 18095+ 2704, an infrared source in Hercules.
The Infrared Astronomy Satellite (IRAS), which in 1983 performed the first survey of infrared sources across the entire sky before finally running out of its vital cooling fluid, is taking on a new job.
Now, however, two research groups have painstakingly subtracted these "local" infrared sources, enabling them to quantify the far-infrared background at DIRBE's two longest wavelengths.
Near-simultaneous outbreaks of similar diseases in widely separated regions are invoked as evidence; so is the spectral signature of carbon compounds in galactic infrared sources. In their epilogue the authors succumb to millennium fever as they attribute the invention of copper smelting, the end of the Roman empire, and numerous other historical benchmarks to periodic comet showers.
This region of Io is peppered with high-temperature infrared sources, so the dark areas (up to 400 km long) are probably immense silicate lava fields.
This explains why hot young stars embedded in dust clouds are such important infrared sources, even though Wien's law tells us that such stars produce relatively little infrared emission on their own.
The Herbig-Haro objects are moving away from a region of luminous infrared sources, the core of the star-forming cloud, where the monumental explosion must have occurred within the past thousand years.

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