Cyanide meaning

sīə-nīd
The anionic univalent CN group, or any of various salts or esters of hydrogen cyanide containing a CN group, especially the extremely poisonous compounds potassium cyanide and sodium cyanide.
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To treat (a metal surface) with cyanide to produce a hard surface.
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To treat (an ore) with cyanide to extract gold or silver.
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A substance composed of a cyanogen group in combination with some element or radical; esp., potassium cyanide, KCN, or sodium cyanide, NaCN, extremely poisonous, white, crystalline compounds with an odor of bitter almonds: used in electroplating, extracting gold from low-grade ores, etc.
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To treat with cyanide.
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Any of a large group of chemical compounds containing the radical CN, especially the very poisonous salts sodium cyanide and potassium cyanide. Cyanides are used to make plastics and to extract and treat metals.
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(chemistry, countable) Any compound containing the -C≡N radical or the C≡N-1 anion.
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(uncountable) Hydrogen cyanide, or cyanide gas - a poisonous gas.
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Origin of cyanide