| 1. Any source of radiant energy, especially electromagnetic radiation. 2. A device that disipates heat from something, as from water or oil, not necessarily by radiation only. Generally, the application of the terms "radiator" (in sense 2) or "heat exchanger" to a particular apparatus depends upon the point of view: If the emphasis is upon merely getting rid of heat, "radiator" is most often used,or sometimes "cooler", if the emphasis is upon transferring heat, "heat exchanger" is used but - these distinctions do not always hold true.
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