1) Freezing mixture 2) Liquid used as a refrigerant 3) Refrigerant 
cryogenic gas. A gas that has been liquified by lowering temperature, usually to a temperature under about -100°C. 
A freezing substance used to produce very low temperatures. ... (05 Mar 2000) ... 
Type: Term Pronunciation: krī′ō-jen Definitions: 1. A freezing substance or mixture used to produce very low temperatures.
Any substance, such as liquid nitrogen, used to produce extreme cold during cryosurgery.
[n] - a liquid that boils at below -160 C and is used as a refrigerant
cryogen A freezing substance used to produce very low temperatures.
noun a liquid that boils at below -160 C and is used as a refrigerant
a substance for producing low temperatures; freezing mixture.