n.1 a person or thing that radiates.
2 a a device for heating a room etc., consisting of a metal case through which hot water or steam circulates. b a usu. portable oil or electric heater resembling this.
3 an engine-cooling device in a motor vehicle or aircraft with a large surface for cooling circulating water.
Phrases and idioms:
radiator grille a grille at the front of a motor vehicle allowing air to circulate to the radiator.