RADIATOR
radiator
(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 vehicle or by a fan
radiator
(noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
radiator
(noun) any object that radiates energy
Source: WordNet® 3.1
Etymology
Noun
radiator (plural radiators)
Anything which radiates or emits rays.
(automotive) A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.
(of buildings) A finned metal fixture that carries hot water or steam in order to heat a room.
(electronics) A type of antenna.
Source: Wiktionary
Ra"di*a`tor, n.
Definition: 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 stream radiator.
Source: Webster’s Unabridged Dictionary 1913 Edition