What is the meaning of Cyanide?

Any compound containing the -C≡N group or the CN anion.

Sodium or potassium cyanide, used in the extraction of gold and silver or as a poison.

Hydrogen cyanide, or cyanide gas, a poisonous gas.

To treat or poison with cyanide.

cyanide (C≡N-based compound)

Source: wiktionary.org