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Dewar bulb

Source : Webster's Revised Unabridged Dictionary (1913)

Dewar vessel \Dew"ar ves`sel\ (d[=u]"[~e]r). [After Sir James
   Dewar, British physicist.]
   A double-walled glass vessel for holding liquid air, 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.
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