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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 ?
A search for the planet at infrared wavelengths, where a young planet is expected to radiate the bulk of its heat, failed to spot it.
It shows that the telescope is in focus and picking up details in infrared wavelengths. Preliminary WISE images will be released in April 2011; a final atlas is to come in March 2012.
Characterizing these cold brown dwarfs is challenging because they emit most of their light at infrared wavelengths, and they are very faint due to their small size and low temperature.
At maximum temperature, halogen tubes emit most of their energy as infrared wavelengths of 1 micron.
WISE is devoted to finding cold or dusty objects that emit most of their light at infrared wavelengths. These bodies include not only nebulae like Heart and Soul, but also galaxies millions of light-years from Earth and asteroids in the solar system.
Northwestern University's Center for Quantum Devices ( may have a hand in this: its scientists have developed a next-generation camera that can be tuned to simultaneously absorb a range of infrared wavelengths and infrared bands.
However, dust particles manage to survive beyond the reach of the most intense radiation, and unlike the high-energy flares from black holes, the radiation emitted by this surviving dust is at longer, infrared wavelengths.
Since dust extinction effects are small at these infrared wavelengths, the method can detect even deeply buried, active SMBHs, which are elusive in optical wavelengths.
With its new Colorcomp Infrared (IR) colorants, LNP now offers custom compounding of broadband infrared filters designed to preferentially allow specific infrared wavelengths to pass through a plastic part.