a substance used in refrigeration; specif., any of various liquids that vaporize at a low temperature, used in mechanical refrigeration
See refrigerant in American Heritage Dictionary 4
adjective
Cooling or freezing; refrigerating.
Medicine Reducing fever.
noun
A substance, such as air, ammonia, water, or carbon dioxide, used to provide cooling either as the working substance of a refrigerator or by direct absorption of heat.