Dewar bottle
A vessel designed to hold liquefied gases. It has double walls with the space between being evacuated to prevent the transfer of heat. The surfaces in the vacuum area are made heat-reflective.
Aviation Maintenance Technician Handbook — Airframe, p. G-12
Also defined in 1 more source
A special container used to store liquid oxygen and liquid nitrogen. A Dewar bottle has an inner and an outer container, and the space between them forms a vacuum. The two surfaces within the vacuum are silvered to reflect heat away from the container walls.
Aviation Maintenance Technician Handbook — Powerplant, p. G-9