Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: cryogen 'substance producing low temperatures' (19-21 centuries), from Greek kryo- (from kryos 'very cold') + English -gen 'producing' (from Greek -genes 'born')

cryogenics

 noun
     
cry‧o‧gen‧ics [uncountable]
the scientific study of very low temperatures
—cryogenic adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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