radiatornoun [ C ]
uk/ˈreɪ.di.eɪ.tər/us/ˈreɪ.di.eɪ.t̬ɚ/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.
My car engine overheated because the water had leaked out of the radiator.
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