cry ‧ o ‧ gen ‧ ics /ˌkraɪəˈdʒenɪks/ BrE AmE noun [uncountable]
[ 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' ) ]
the scientific study of very low temperatures
—cryogenic adjective