Dewar vessel
noun
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 of Dewar vessel
1900–05; named after Sir James
Dewar, its inventor
British Dictionary definitions for dewar flask
Dewar flask
/ (ˈdjuːə) /
noun
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