The Collaborative International Dictionary
Refrigerator \Re*frig"er*a`tor\ (-?`t?r), n. 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.
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An apparatus for rapidly cooling heated liquids or vapors, connected with a still, etc.
Refrigerator car (Railroad), a freight car constructed as a refrigerator, for the transportation of fresh meats, fish, etc., in a temperature kept cool by ice.
WordNet
n. a freight car that is equipped with refrigeration system
Wikipedia
A refrigerator car (or "reefer") is a refrigerated boxcar (U.S.), a piece of railroad rolling stock designed to carry perishable freight at specific temperatures. Refrigerator cars differ from simple insulated boxcars and ventilated boxcars (commonly used for transporting fruit), neither of which are fitted with cooling apparatus. Reefers can be ice- cooled, come equipped with any one of a variety of mechanical refrigeration systems, or utilize carbon dioxide (either as dry ice, or in liquid form) as a cooling agent. Milk cars (and other types of "express" reefers) may or may not include a cooling system, but are equipped with high-speed trucks and other modifications that allow them to travel with passenger trains.
Usage examples of "refrigerator car".
Frank and Joe were seized tightly, then heaved bodily up and into the yawning door of the moving refrigerator car.
Luders doesn't want half a million dollars' worth of queer money in his cabin at the club, so he finds himself an old mine over here and keeps the money in this refrigerator car.