Cryo

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

Biology and medicine

 * 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

Other uses

 * Cryo Interactive, a video game company
 * Cryos, a planet in the video game Darkspore