vacuum flask

Other forms: vacuum flasks

Definitions of vacuum flask
  1. noun
    flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
    synonyms: vacuum bottle
    see moresee less
    types:
    Dewar, Dewar flask
    vacuum flask that holds liquid air or helium for scientific experiments
    thermos, thermos bottle, thermos flask
    vacuum flask that preserves temperature of hot or cold drinks
    type of:
    flask
    bottle that has a narrow neck
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