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Dew·ar flask(do͞o′ər, dyo͞o′-)
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.
[After Sir James Dewar (1842-1923), British chemist and physicist who invented it.]
(Chemistry) a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos
[C20: named after Sir James Dewar]