What does Infrared mean?

Definitions for Infrared

Here are all the possible meanings and translations of the word Infrared.

Princeton's WordNet

  1. infrared, infrared frequency(noun)

    the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range

    "they could sense radiation in the infrared"

  2. infrared, infrared light, infrared radiation, infrared emission(adj)

    electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves

  3. infrared(adj)

    having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end

    "infrared radiation"; "infrared photography"


  1. infrared(Noun)

    electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm

  2. infrared(Adjective)

    In the infrared spectrum.

  3. infrared(Adjective)

    Having the wavelength in the infrared.

  4. Origin: Latin infra, below, + red


  1. Infrared

    Infrared light is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometres to 1 mm. This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz, and includes most of the thermal radiation emitted by objects near room temperature. Infrared light is emitted or absorbed by molecules when they change their rotational-vibrational movements. The existence of infrared radiation was first discovered in 1800 by astronomer William Herschel. Slightly more than half of the energy from the Sun arrives on Earth in the form of infrared radiation. The balance between absorbed and emitted infrared radiation has a critical effect on the Earth's climate. Infrared energy elicits vibrational modes in a molecule through a change in the dipole moment, making it a useful frequency range for study of these energy states for molecules of the proper symmetry. Infrared spectroscopy examines absorption and transmission of photons in the infrared energy range. Infrared light is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space, such as molecular clouds; detect objects such as planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus.

Suggested Resources

  1. infrared

    Song lyrics by infrared -- Explore a large variety of song lyrics performed by infrared on the Lyrics.com website.

How to pronounce Infrared?

  1. Alex
    US English

How to say Infrared in sign language?

  1. infrared


  1. Chaldean Numerology

    The numerical value of Infrared in Chaldean Numerology is: 1

  2. Pythagorean Numerology

    The numerical value of Infrared in Pythagorean Numerology is: 3

Examples of Infrared in a Sentence

  1. Al Starcevich:

    The creepy thing is they’re only doing it at night. What are you going to see at night unless you have an infrared camera ?

  2. Alon Gorodetsky:

    Soldiers wear uniforms with the familiar green and brown camouflage patterns to blend into foliage during the day, but under low light and at night, they're still vulnerable to infrared detection, you can draw inspiration from natural systems that have been perfected over millions of years, giving us ideas we might never have been able to come up with otherwise.

  3. Geoffrey Carter:

    The infrared looks for a flash from a gunshot and the acoustics listens for the bang, so we get the flash and the bang, and then we cue the operator. The accoustics get us very accurate azimuth, or bearing, to the threat. The combination of knowing the speed of light and the speed of sound, we’re able to get the distance in the time of arrival to the threat.

  4. Jeff White:

    The millimeter wave radar turns on first. Then the data link gives it a cue and tells the seeker where to open up and look. Then it turns on its IR (infrared) which uses heat seeking technology.

  5. Alon Gorodetsky:

    There is a lot of flexibility in how one can deploy this material, essentially, by taking the stickers and putting them all over yourself, you could look one way under optical visualization and another way under an active infrared visualization camera.

Images & Illustrations of Infrared

  1. InfraredInfraredInfraredInfraredInfrared

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