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.

Origin of Dewar vessel

1900–05; named after Sir James Dewar, its inventor

Also called Dewar, Dewar flask. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for dewar flask

Dewar flask

/ (ˈdjuːə) /


a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos

Word Origin for Dewar flask

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