Radiator /(rā"dĭ*ā`tẽr)/

Ra·di·a·tor

Radiator

n.
  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. An oscillator. (Wireless Teleg.)