radiant : Idioms & Phrases

• noun energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter
  

WordNet

• (Physics), energy given out or transmitted by radiation, as in the case of light and radiant heat.

Webster 1913

• noun the rate of flow of radiant energy (electromagnetic waves)
  

WordNet

• proceeding in right lines, or directly from the heated body, after the manner of light, in distinction from heat conducted or carried by intervening media.

Webster 1913

• noun heating a building by radiation from panels containing hot water or electrical heaters
  

WordNet

• . (Astron.) See Radiant, n., 3.

Webster 1913