infrared

adj. (Abbr. IR)

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.

An invisible band of radiation at the lower end of the visible light spectrum. With wavelengths from 750 nm to 1 mm, infrared starts at the end of the microwave spectrum and ends at the beginning of visible light. Infrared transmission typically requires an unobstructed line of sight between transmitter and receiver.

Widely used in most audio and video remote controls, infrared transmission is also used for wireless connections between computer devices (see IrDA) and a variety of detectors (see IR detector). See IR remote control and IRED.

Infrared in the Spectrum

The infrared band comes after the microwave range and ends at visible light.

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adj. 1. (of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.

2. (of equipment or techniques) using or concerned with this radiation: infrared cameras.

n.

the infrared region of the spectrum; infrared radiation.

See the Introduction, Abbreviations and Pronunciation for further details.

The waves of the electromagnetic spectrum just outside the visible light spectrum, ≈ 30 to 430 THz frequency (just below red light).

That region of the electromagnetic spectrum at wavelengths immediately above the visible spectrum; the heat in this region of the spectrum which is generated by a light source usually is undesirable (since it represents a loss in efficiency), but such heat is used in industrial applications for drying, baking a surface, etc.

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Denoting electromagnetic radiation of wavelength greater than that of the red end of the spectrum, having wavelengths 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 10 mm. 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.

Dansk (Danish)
adj. - infrarød
n. - infrarødt område

Nederlands (Dutch)
infrarood

Français (French)
adj. - infrarouge
n. - infrarouge

Deutsch (German)
n. - Infrarot
adj. - infrarot

Ελληνική (Greek)
n. - υπέρυθρη ακτίνα
adj. - υπέρυθρος

Italiano (Italian)
infrarosso

Português (Portuguese)
n., -
adj. - infravermelho (m) (Fís.)

Русский (Russian)
инфракрасный

Español (Spanish)
adj. - infrarrojo
n. - luz infrarroja, rayos infrarrojos

Svenska (Swedish)
n. - infrarött
adj. - infraröd

中文（简体）(Chinese (Simplified))
红外线的, 红外线

中文（繁體）(Chinese (Traditional))
adj. - 紅外線的
n. - 紅外線

한국어 (Korean)
adj. - 적외선의, 적외선에 민감한
n. - 적외선

日本語 (Japanese)
adj. - 赤外線の
n. - 赤外線, 赤外部

العربيه (Arabic)
‏(الاسم) الأشعه تحت الحمراء (صفه) دون الأحمر, تحت الأحمر‏

עברית (Hebrew)
adj. - ‮תת-אדום, של קרניים תת-אדומות‬
n. - ‮קרניים באורך תדר גדול מזה של האור האדום (בלתי נראים)‬

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infrared	Infrared Earbud
Infrared Goggles	brother infrared