Meaning

noun any object that radiates energy

noun heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings

noun a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the ve

originFrom radiate + -or. Doublet of radiatori.

Etymology from Wiktionary, CC BY-SA 3.0