radiant heat

noun Thermodynamics.
heat energy transmitted by electromagnetic waves in contrast to heat transmitted by conduction or convection.

Origin:
1500–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radiant heat
 
n
heat transferred in the form of electromagnetic radiation rather than by conduction or convection; infrared radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Each room has hardwood floors, marble bathrooms with radiant heat, towel
  warmers and plush bedding.
The advantage of radiant heat over forced air heating is that the former heats
  you rather than the whole house.
Temperature and humidity sensors throughout the house control four heating and
  cooling systems, plus in-floor radiant heat.
The floor's radiant heat keeps the home toasty throughout the winter.
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