You searched for: “cryostat
cryostat (s) (noun), cryostats (pl)
1. A device by which a certain temperature can be maintained at a very low level: The specimen was put in a cryostat which cooled it down considerably.
2. A freezing chamber: The students were introduced to the cryostat where they would be cutting microscopically fine parts of tissues with a microtome.