Definition of Radiator

Noun: radiator 'rey-dee,ey-tu(r)

Any object that radiates energy
Heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
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