Cryo- is from the Ancient Greek κρύος (krúos, “ice, icy cold, chill, frost”). Uses of the prefix Cryo- include: Physics and geology. Cryogenics, the study of the production and behaviour of materials at very low temperatures and the study of producing extremely low temperatures. Cryoelectronics, the study of superconductivity under cryogenic conditions and its applications. Cryosphere, those portions of Earth's surface where water ice naturally occurs. Cryotron, a switch that uses superconductivity. Cryovolcano, a theoretical type of volcano that erupts volatiles instead of molten rock.
https://en.wikipedia.org/wiki/Cryo