from
The Collaborative International Dictionary of English v.0.48
Dewar \Dew"ar\ (d[=u]"[~e]r), Dewar vessel \Dew"ar ves`sel\,
Dewar flask \Dew"ar flask\ [After Sir James Dewar, British
physicist.]
A double-walled glass vessel for holding liquid air, liquid
nitrogen, etc., having the space between the walls exhausted
so as to prevent conduction of heat, and sometimes having the
glass silvered to prevent absorption of radiant heat; --
called also, according to the particular shape,
{Dewar bulb},
{Dewar tube}, etc.
[Webster 1913 Suppl. +PJC]