# infrared
## English
### Etymology

From infra- +‎ red.

### Pronunciation

* (UK, US, Canada) IPA: /ˌɪnfɹəˈɹɛd/
** Audio (Southern England):(file)
* (General Australian) IPA: /ˌɪnfɹəˈɹed/

### Noun

infrared (countable and uncountable, plural infrareds)
* (uncountable) The electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm.
    Hypernym: electromagnetic radiation
** 1962, John Nelson Howard, Transmission of the Atmosphere in the Infrared: A Review, page 3:Collisions of these 'transparent' molecules with the molecules that do have absorption bands in the infrared can have a considerable influence on the intensities of the observed absorption bands.
* (countable) A specific wavelength in this range.
** 1924, The American Review of Tuberculosis, page 110:Sonne has shown that by means of the luminous rays the temperature in the tissue may be raised to a higher degree than by the use of the infrareds.
** 2009, Alexander Grankov, Microwave Radiation of the Ocean-Atmosphere: Boundary Heat and Dynamic Interaction:Exposure of spectral pieces at centimeters, millimeters, and infrareds, which provide a top steadiness of the dependence "MCW radiation vs. parameter Δt" and its interannual (seasonal) dynamics.
* (countable) A device that emits infrared radiation.
** 2000, Pete Fowler, Keeps, page 62:In his room, he could install his infrareds without being discovered.
** 2007, Ed Morawski, Solving the Security Puzzle, page 79:Beams are the active counterparts of passive infrareds (PIRs). Since these are active infrareds, they require two parts: a transmitter and a receiver.
** 2020, Jenny Dorsey, The Infrared Grill Master: Recipes and Techniques for Perfectly Seared, Deliciously Smokey BBQ Every Time:Additionally, infrareds tend to cook food faster so there's less time to render said fat.

#### Translations
### Adjective

infrared (not comparable)
* Having a wavelength in the infrared spectrum.
    Hyponyms: mid-infrared, near-infrared
* (figurative, physics) Relating to very low energies or very large distances or time spans.
    Antonym: ultraviolet
** 1986, Luis Álvarez-Gaumé, “An Introduction to Anomalies”, in G. Velo, A. S. Wightman, editors, Fundamental Problems of Gauge Field Theory, →ISBN, page 97:Unless otherwise stated, we will be working in Euclidean space compactified to a sphere in order to avoid infrared problems.
** 2000, Andreas Galka, Topics in Nonlinear Time Series Analysis: With Implications for EEG Analysis, →ISBN, page 176:Secondly, as stated already by Osborne & Provenzale, pure k$^{-α}$-behaviour is impossible since there would have to be infinite power at zero frequency (this would correspond to an infrared catastrophe).
** 2010, Taizo Muta, Foundations of Quantum Chromodynamics: An Introduction to Perturbative Methods in Gauge Theories, 3rd edition, →ISBN, page 331:Although infrared divergences are of long-distance nature, they often play an essential role in the verification of the validity of the perturbative treatment of short-distance phenomena.

#### Derived terms

* cosmic infrared background
* infrared astronomy
* infrared camera
* infrared detector
* infrared divergence
* infrared film
* infrared filter
* infrared fixed point
* infrared homing
* infrared imagery
* infrared lamp
* infrared light
* infrared microscope
* infrared motion detector
* infrared multiphoton dissociation
* infrared photography
* infrared pointer
* infrared port
* infrared radiation
* infrared remote control
* infrared repellor
* infrared sauna
* infrared spectroscopy
* infrared thermography
* infrared thermometer
* infrared waves
* mediumwave infrared
* midinfrared
* near infrared
* noninfrared

#### Translations
### Further reading

* infrared on Wikipedia.Wikipedia