- any of a class of organic compounds with the general formula RC≡N.
- any one of a class of organic compounds containing the monovalent group -CNAlso called (not in technical usage): cyanide
- An organic cyanide containing a CN group.
- An organic compound, such as acrylonitrile, containing the cyanide group CN. Nitriles are typically colorless solids or liquids and have a distinctive smell.