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"Dewar" Definition

noun

A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.
Source: Wiktionary
A glass or metal container made like a vacuum bottle that is used especially for storing liquefied gases .

biographical name

Sir James 1842–1923 Scot. chem. & physicist.