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vacuum flask

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noun
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 temperaturesAlso called: Thermos, Dewar flask
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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