: a substance for obtaining low temperatures : refrigerant

called also cryogenic

Examples of cryogen in a Sentence

Recent Examples on the Web
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Another problem is that this approach requires a complicated cryocooling system that includes pumps, seals, gaskets, pipes, insulation, a rotary coupling that transfers the cryogen into and out of the rotor, and other components that can fail and that add considerable weight. — IEEE Spectrum, 26 June 2025

Word History

Etymology

cryo- + -gen

First Known Use

1875, in the meaning defined above

Time Traveler
The first known use of cryogen was in 1875

Browse Nearby Words

Cite this Entry

“Cryogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cryogen. Accessed 9 Oct. 2026.

Medical Definition

: a substance for obtaining low temperatures

called also cryogenic

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