dewar flask

Dewar vessel

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.

1900–05; named after Sir James Dewar, its inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Dewar flask (ˈdjuːə)
a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos
[C20: named after Sir James Dewar]

Collins English Dictionary - Complete & Unabridged 10th Edition
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