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vacuum flask

noun
1.
an insulating flask that has double walls, usually of silvered glass, with an evacuated space between them. It is used for maintaining substances at high or low temperatures Also called Thermos, Dewar flask
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for vacuum flask

vessel with double walls, the space between which is evacuated. It was invented by the British chemist and physicist Sir James Dewar in the 1890s. Thermos is a proprietary name applied to a form protected by a metal casing

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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