English Lexicon

Infrared Radiation

/ˌɪnfrəˈrɛd ˌreɪdiˈeɪʃən/
nounCEFR B2 (Upper)Top #1500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    Electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves, typically ranging from 700 nanometers to 1 millimeter.

    "Infrared radiation is commonly used in thermal imaging cameras to detect heat."
  2. 2

    A type of radiation that is emitted by objects based on their temperature, often utilized in various technologies including remote controls and night vision devices.

    "Many remote controls operate using infrared radiation to communicate with electronic devices."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The term 'infrared' is derived from the Latin prefix 'infra-', meaning 'below', and 'red', referring to the red part of the visible spectrum. 'Radiation' comes from the Latin 'radiatio', meaning 'a sending out'. The term has evolved since the late 19th century as scientists discovered electromagnetic waves beyond the visible spectrum.

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