a device, usually a container filled with water, that sends out heat, often as part of a heating or cooling system

When we installed the central heating, we put a radiator in every room. 我们安装中央供暖系统时，在每个房间都安了散热器。

My car engine overheated because the water had leaked out of the radiator. 我的汽车引擎过热，原因是散热器漏水。