Radiator
Radiator (rā"di*ā`tẽr) , noun
1.
That which radiates or emits rays, whether of light or heat; especially, that part of a heating apparatus from which the heat is radiated or diffused; as, a steam radiator.
2.
Any of various devices for cooling an internal substance by radiation, as a system of rings on a gun barrel for cooling it, or a nest of tubes with large radiating surface for cooling circulating water, as in an automobile.
3.
(Wireless Telegraphy) An oscillator.