#cyanide  an extremely poisonous salt of hydrocyanic acid
  supertype:  salt  a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)
  subtype:  sodium_cyanide  a white poisonous salt (NaCN) used in electroplating
  subtype:  potassium_cyanide__potassiumcyanide  a poisonous salt (KCN) used in electroplating and in photography

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