Definition of vacuum flask in US English:

vacuum flask

noun

British
  • another term for thermos
    • ‘Mix in the coriander and pour hot into a large vacuum flask.’
    • ‘Make sure you have enough warm clothing, that your mobile phone is fully charged, and take a vacuum flask with a hot drink.’
    • ‘You'll appreciate a warm drink from a vacuum flask, too.’
    • ‘Pouring the liquid oxygen from a vacuum flask he created 10 inches of frost inside the bomb and was able to defuse it successfully.’
    • ‘Vacuum flasks can help maintain flavour.’
    bottle, container, vessel
    View synonyms

Pronunciation

vacuum flask

/ˈvækj(əw)əm/