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From Biology-Online Dictionary
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That which refrigerates or makes cold; that which keeps cool. Specifically:

A box or room for keeping food or other articles cool, usually by means of ice.

An apparatus for rapidly cooling heated liquids or vapors, connected with a still, etc. Refrigerator car, a freight car constructed as a refrigerator, for the transportation of fresh meats, fish, etc, in a temperature kept cool by ice.