dewar

name

1. (countable, uncountable)A surname from Scottish Gaelic.
2. (countable, uncountable)An unincorporated community in Black Hawk County, Iowa, United States.
3. (countable, uncountable)A city in Okmulgee County, Oklahoma, United States.

noun

1. 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.
2. A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.

   “A large thermos-like container called a dewar contained 645 gallons of liquid helium to be cooled to within two degrees of absolute zero.”