Definition of cryogen noun from the Oxford Advanced Learner's Dictionary

 

cryogen

 noun
noun
BrE BrE//ˈkraɪədʒən//
 
; NAmE NAmE//ˈkraɪədʒən//
 
(physics)
 
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any liquid that is used to produce very low temperatures
See the Oxford Advanced American Dictionary entry: cryogen