#flask  bottle that has a narrow neck
  supertype:  #bottle  glass or plastic vessel; cylindrical with a narrow neck; no handle
  subtype:  #ampulla  a flask that has two handles; used by Romans for wines or oils
  subtype:  #canteen  a flask for carrying water; used by soldiers or travelers
  subtype:  #Erlenmeyer_flask  a conical flask with a wide base and narrow neck
  subtype:  #hipflask__pocket_flask  a flask that holds spirits
  subtype:  #round-bottom_flask  a spherical flask with a narrow neck
  subtype:  #vacuum_flask__vacuum_bottle  flask with double walls separated by vacuum; used to maintain substances at high or low temperatures
     subtype:  #Dewar_flask__Dewar  vacuum flask that holds liquid air or helium for scientific experiments
     subtype:  #thermos_bottle__thermosbottle__thermos__thermos_flask__thermosflask  vacuum flask that preserves temperature of hot or cold drinks

No statement uses or specializes #flask; click here to add one.