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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 ?
* 1064 nanometers--near infra-red radiation, invisible to an eye, but "visible" for devices of night vision;
Thus, relative to the line of centres (a curved Riemannian arc) of the earth born measurement laboratory and the very distant black holes, the neutrino flux that is emanating from the outer regions of the universe, and opposing the escape of both x-rays and infra-red radiation toward the observer, has a higher particle density, than the neutrino flux that is opposing (due to collisions and associated net exchange of total momenta) the escape of electromagnetic radiation in the direction of the periphery of the universe.
Bathed in ultraviolet, gamma and infra-red radiation due to its proximity to its sun, the atmosphere is said to be inhospitable.
In the case of global warming, the sustainable resource is an atmosphere actually capable of absorbing the infra-red radiation of the sun without too much warming of the lower atmosphere and oceans.
The de-icing method reportedly means that the aircraft will be de-iced by infra-red radiation lamps inside a big hangar.
Non-fried systems use infra-red radiation to set the coating, with formulations altered to set at lower temperatures.
It produces infra-red radiation which burns the retina.
Conceptually, heating a particle under infra-red radiation surrounded by air is equivalent to a heat source inside the solid or on the solid's surface [5].
They claim that surveillance equipment used by British troops is sending out microwaves and infra-red radiation that can cause cancers.