(1) Vacuum flask that holds liquid air or helium for scientific experiments
(2) Scottish chemist and physicist noted for his work in cryogenics and his invention of the Dewar flask (1842-1923)
WiktionaryText
Noun
A glass or metal double-walled flask for holding a liquid without much loss or gain of heat; a vacuum bottle or thermos. Generally used for scientific purposes and in particular for cryogenic work.
