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WordNet
sodium cyanide

n. a white poisonous salt (NaCN) used in electroplating

Wikipedia
Sodium cyanide

Sodium cyanide is an inorganic compound with the formula Na C N. It is a white, water-soluble solid. Cyanide has a high affinity for metals, which leads to the high toxicity of this salt. Its main application, in gold mining, also exploits its high reactivity toward metals. When it is treated with acid, it forms the toxic gas hydrogen cyanide:

NaCN + HSO → HCN + NaHSO

Usage examples of "sodium cyanide".

But don't get too worried, there's a sodium cyanide and a potassium cyanide.

The two small bowls floating rim to rim directly over his head held enough sodium cyanide powder in the space between them to kill him ten times over.

Though it was poisonous, and potentially dangerous even under controlled conditions, she'd chosen sodium cyanide.