Definition of vacuum flask noun from the Oxford Advanced Learner's Dictionary


vacuum flask

BrE BrE//ˈvækjuəm flɑːsk//
; NAmE NAmE//ˈvækjuəm flæsk//
(also flask) (both British English) (US English vacuum bottle)
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a container like a bottle with double walls with a vacuum between them, used for keeping liquids hot or cold compare Thermos™