#fluoride  a salt of hydrofluoric acid
  supertype:  #halide  a salt of any halogen acid
  subtype:  #boron_trifluoride__borontrifluoride  a pungent colorless gas
  subtype:  #hydrogen_fluoride  a colorless poisonous corrosive liquid made by the action of sulphuric acid on calcium fluoride; solutions in water are hydrofluoric acid
  subtype:  #stannous_fluoride  a white powder that is used to fluoridate toothpaste

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