vacuum flask, vacuum bottle(noun)
flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
vacuum flask(noun)A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents
vacuum flask(noun)A Dewar vessel is the scientific version, and is most often used to store liquified gases.
vacuum flask(noun)A type of glass flask used in a laboratory similar to an Erlenmeyer flask, but with a side spout used for connection to an aspirator. Also known as a B\u00FCchner flask.
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