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The Simple English Wikipedia has an article on:

Pronunciation

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Singular
flask

Plural
flasks

 
A pocket flask.
 
A laboratory flask.
  1. (countable) A flask is a small, flat container used for carrying liquids, especially alcohol, in a pocket.
    He took a sip of whiskey from the silver flask in his coat.
  2. (countable) A flask is a container used in laboratories to hold, heat, or mix liquids.
    The scientist poured the solution into the flask to start the experiment.