Cryo

Cryo- is from Ancient Greek κρύος (krúos, “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
Cryotronics, the production of electronics that use superconductivity
- Cryotron, a switch that uses superconductivity
Cryovolcano, a theoretical type of volcano that erupts volatiles instead of molten rock

Cryobiology, the branch of biology that studies the effects of low temperatures on living things
Cryonics, the low-temperature preservation of people who cannot be sustained by contemporary medicine
Cryoprecipitate, a blood-derived protein product used to treat some bleeding disorders
Cryotherapy, medical treatment using cold
- Cryoablation, tissue removal using cold
- Cryosurgery, surgery using cold
Cryo-electron microscopy (cryoEM), a technique that fires beams of electrons at proteins that have been frozen in solution, to deduce the biomolecules’ structure

Cryo Interactive, a video game company
Cryos, a planet in the video game Darkspore
Cryos International, the Worlds largest donor sperm bank and International donor egg bank

The dictionary definition of cryo- at Wiktionary