Dewar
/dˈuər/
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Definition
(noun) A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.
Sentence Examples
The dewar flask kept the liquid cold.
He used a dewar to store the sample.
CEFR Practice Quiz
The ____ flask kept the liquid cold.