cyanide

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

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

• The birdies all try an' hide / But they still go for peanuts / When coated with cyanide
• The vast majority of the victims, on Jones’s orders, had drunk a fruit punch mixture laced with cyanide, a deadly poison. Adults had fed the poisoned liquid to the children, including infants.

Hydrogen cyanide, or cyanide gas, a poisonous gas.uncountable

To treat or poison with cyanide.transitive