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English Lexicon

Thermal Radiation

/ˈθɜːr.məl ˌreɪ.diˈeɪ.ʃən/
nounCEFR C1 (Advanced)Top #8500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.

    "The sun's thermal radiation is essential for life on Earth."
  2. 2

    Heat energy that is transferred through electromagnetic waves, which can occur in a vacuum.

    "Thermal radiation can be observed in the warmth felt from a fire even at a distance."
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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The term combines 'thermal' derived from the Ancient Greek 'thermos' (meaning warm or hot) and 'radiation' originating from the Latin 'radius' (meaning staff, ray, or spoke of a wheel). It entered standard scientific English in the 19th century as thermodynamics and wave theory advanced in physics.

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