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Dewar vessel

noun
1.
a container with an evacuated space between two walls that are highly reflective, capable of maintaining its contents at a near-constant temperature over relatively long periods of time; thermos.
Also called Dewar, Dewar flask.
Origin
1900-1905
1900-05; named after Sir James Dewar, its inventor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dewar flask

Dewar flask

/ˈdjuːə/
noun
1.
a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos
Word Origin
C20: named after Sir James Dewar
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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