Noun dewar has 2 senses
  1. Dewar flask, Dewar - vacuum flask that holds liquid air or helium for scientific experiments
    --1 is a kind of vacuum flask, vacuum bottle
  2. Dewar, Sir James Dewar - Scottish chemist and physicist noted for his work in cryogenics and his invention of the Dewar flask (1842-1923)
    --2 is a kind of chemist; physicist
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