noun, noun which may take the genitive case particle 'no'
radiant heat; photothermal
Technical term in physics and engineering for heat transferred by electromagnetic radiation, especially infrared. Often used attributively with の.
The room is warmed by radiant heat.
Calculate the effect of radiant heat.
Compound of 輻射 (ふくしゃ, 'radiation', literally 'spoke-like emission') and 熱 (ねつ, 'heat'). The term is a technical calque from Western physics.