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vacuum flask

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{n: Dewar flask, Dewar} vacuum flask that holds liquid air or helium for scientific experiments

{n: thermos, thermos bottle, thermos flask} vacuum flask that preserves temperature of hot or cold drinks

{n: vacuum flask, vacuum bottle} flask with double walls separated by vacuum; used to maintain substances at high or low temperatures

{v: evacuate, exhaust} create a vacuum in (a bulb, flask, reaction vessel, etc.)

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