radiator

radiator
noun

a thing that radiates or emits light, heat, or sound
辐射体
■a device for heating a room consisting of a metal case connected by pipes through which hot water is pumped by a central heating system
暖气片，散热器
■a portable oil or electric heater resembling such a device
（暖气片型）燃油炉，电热器
an engine-cooling device in a motor vehicle or aircraft consisting of a bank of thin tubes in which circulating water is cooled by the surrounding air
（汽车或飞机的）散热器