cryogenic /ˌkɹaɪoʊˈd͡ʒɛnɪk/ adjective1 •Of, relating to, or performed at low temperatures.Quick as a mongoose, the man with the glass eye darts in, yanks the aluminum case out of the cryogenic cylinder, tosses it to Y.T. — 1992 formsmore cryogenic · most cryogenic