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radiant heat

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

Origin of radiant heat

First recorded in 1500–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for radiant heat

radiant heat

noun
  1. heat transferred in the form of electromagnetic radiation rather than by conduction or convection; infrared radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012