D defs.my
Entry 3 senses Webster, 1913

Radiator

/(rā"dĭ*ā`tẽr)/ · Ra·di·a·tor · IPA /ˈɹej.di(j)ˌej.tɚ/
01 n. That which radiates or emits rays, whether of light or heat; especially, that part of a heating apparatus from which the heat is radiated o…
  1. 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. 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. 3.
    An oscillator.(Wireless Teleg.)