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radiation biology
radiation oncology
radiation pressure
radiation sickness
radiation therapy
radiational cooling
radiative collision
radiative forcing
radiator
radical
radical chic
radical sign
radicalise
radicalism
radicalize
radicand
radicchio
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radiator

ra·di·a·tor [ ráydee àytər ] (plural ra·di·a·tors)


noun 
Definition:
 
1. room heater with pipes: a room-heating device that emits heat from pipes through which hot water, steam, or hot oil circulates, especially one connected to a central boiler-fed system

2. automotive engine-cooling device: a device that prevents a vehicle's engine from overheating, consisting of tubes through which heated water from the engine circulates to be cooled. Cool air is usually circulated around the tubes by means of a fan.

3. physics device emitting radiant energy: a device that emits radiant energy, e.g. a light bulb or a television transmitter

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