cryostat

n.
An apparatus used to maintain constant low temperature.

cryostatic cry'o·stat'ic adj.

A vessel enabling a sample to be maintained at a very low temperature. The Dewar flask is the most satisfactory vessel for controlling heat leaking in by radiation, conduction, or convection. Cryostats usually consist of two or more Dewar flasks nesting in each other. For example, a liquid nitrogen bath is often used to cool a Dewar flask containing a liquid helium bath.

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1. a device by which temperature can be maintained at a very low level.
2. in pathology and histology, a chamber containing a microtome for sectioning frozen tissue.

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The noun has one meaning:

Meaning #1: a thermostat that operates at very low temperatures

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