dewar
/ˈduːər/
noun
- A container (usually a flask or bottle) designed to keep liquids very cold, such as liquid nitrogen or liquid air, by using a vacuum between two walls.
- A dewar is essential for storing cryogenic fluids without them boiling away too quickly.
- The lab technician carefully poured liquid nitrogen from the dewar into the experiment.
- The hospital uses a large dewar to keep medical samples frozen during transport.