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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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