- noun a device that cools steam or other vapour and turns it back into liquid
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- The heat exchanger in a refrigeration system that removes heat from the high pressure refrigerant gas and transforms it into a cool liquid.
- A device which changes a gas into a liquid or a solid.
- A system of mirrors and/or lenses which collects light from a source, then directs it onto a surface. Used, for instance, in a microscope.
- A nearly obsolete term for capacitor.