[krahy-uh-juhn, -jen]
a substance for producing low temperatures; freezing mixture.

1870–75; cryo- + -gen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cryogen (ˈkraɪədʒən)
a substance used to produce low temperatures; a freezing mixture

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

cryogen cry·o·gen (krī'ə-jən)
A liquid, such as liquid nitrogen, that boils at a temperature below about 110 Kelvin (-160°C) and is used to obtain very low temperatures; a refrigerant.

The American Heritage® Stedman's Medical Dictionary
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