Definitions for vacuum bottle
Random House Webster's College Dictionary
a bottle or flask having a double wall enclosing a vacuum to retard heat transfer; thermos.
Origin of vacuum bottle:
vacuum flask, vacuum bottle(noun)
flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
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"vacuum bottle." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/vacuum bottle>.