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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 ?
Infared viewing windows in low- and medium-voltage electrical distribution equipment allow infared inspections to be made without removing panels, which requires the wearing of personal protective equipment.
and the electromagnetic (EM) seeker will remain the same, though Thales is currently developing an infared (IR) seeker that will be found on a later version for France, according to MBDA program engineers.
US-based Lely Res Holding is developing a robotic vehicle which can identify animals based on their electronic tags, and monitor their health using an infared camera and radar system.
The teacher makes announcements about the week's schedule, then "beams" (transfers information via infared technology from one handheld to another) a description of the week's events to the first student in each row, who passes the information along to other classmates by beaming.
Two NDC Infared Engineering online gauging systems are new from medical company Smith and Nephew.
Quantitative Fourier-transform infared analysis of gas-phase cigarette smoke and other gas mixtures.
Infared (IR) Energy: Part of a complete range of radiation called the electromagnetic spectrum.
Store up to 100 black and white pictures or download your favourites to your computer via infared. Visit and get snapping.
It's equipped with a colour camera in the nose, a TV camera, an infared camera for night flights, and a radar for peering through smoke, clouds, or haze.
Investigation of urinary crystals by Fourier transform infared microscopy.
Allamandola, an infared astrophysicist at NASA's Ames Research Center in Mountain view, Calif.
Rather, the Remote Monitoring FTS compares the intensity of infared light detected at many different wavelengths to determine whether or not a part type of molecule - and, therefore, chemical solvent or agent - is present.