noun. 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.

transitive verb. To treat (a metal surface) with cyanide to produce a hard surface.

transitive verb. To treat (an ore) with cyanide to extract gold or silver.

noun. In chem., a combination of cyanogen with an element or a compound radicle capable of acting as an element.

To treat an ore with a weak solution of an alkaline cyanide, as in the cyanide process for the extraction of gold. See cyanide process.

noun. A compound formed by the union of cyanogen with an element or radical.

noun. (countable) Any compound containing the -C≡N radical or the C≡N-1 anion.

noun. potassium cyanide - a water soluble poison

noun. hydrogen cyanide, or cyanide gas - a poisonous gas

noun. any of a class of organic compounds containing the cyano radical -CN

noun. an extremely poisonous salt of hydrocyanic acid