An insulated container used especially to store liquefied gases, having a double wall with a vacuum between the walls and silvered surfaces facing the vacuum.
A double-walled flask with a vacuum between the walls, which are silvered on the inside, used esp. for storage of liquefied gases.
Origin of dewar-flask
- After Sir James Dewar (1842–1923), British chemist and physicist who invented it
From American Heritage Dictionary of the English Language, 5th Edition