Noun flask has 2 senses
  1. flask - bottle that has a narrow neck
    --1 is a kind of
    bottle
    --1 has particulars:
     ampulla; canteen; Erlenmeyer flask; hipflask, pocket flask; round-bottom flask; vacuum flask, vacuum bottle
  2. flask, flaskful - the quantity a flask will hold
    --2 is a kind of containerful
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