Definition of vacuum flask in English:

vacuum flask

Line breaks: vac¦uum flask


chiefly British
  • A container that keeps a substance hot or cold by means of a double wall enclosing a vacuum.
    More example sentences
    • Make sure you have enough warm clothing, that your mobile phone is fully charged, and take a vacuum flask with a hot drink.
    • Pouring the liquid oxygen from a vacuum flask he created 10 inches of frost inside the bomb and was able to defuse it successfully.
    • You'll appreciate a warm drink from a vacuum flask, too.

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