cyanide
Ion derived from hydrogen cyanide (HCN), and any salt containing this ion (produced when hydrogen cyanide is neutralized by alkalis), such as potassium cyanide (KCN). The principal cyanides are potassium, sodium, calcium, mercury, gold, and copper. Most cyanides are poisons.
Organic compounds containing a CN group are sometimes called cyanides but are more properly known as nitriles.
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