cryogen

noun
cryo·​gen | \ˈkrī-ə-jən \

Definition of cryogen 

: a substance for obtaining low temperatures : refrigerant

called also cryogenic

First Known Use of cryogen

1875, in the meaning defined above

History and Etymology for cryogen

cryo- + -gen

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The first known use of cryogen was in 1875

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cryogen

noun
cryo·​gen | \ˈkrī-ə-jən \

Medical Definition of cryogen 

: a substance for obtaining low temperatures

called also cryogenic

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