n. any object that radiates energy
n. heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
n. 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
n. （暖气设备的）散热器( radiator的复数形式 ); 汽车引擎的冷却器, 散热器