Definition of class A or B or C drug in English:
An illegal narcotic drug classified as being of the most harmful and addictive (or a less harmful and addictive) kind, possession or sale of which incurs corresponding legal penalties.
- He was jailed for 30 months for possession of class A drugs, namely heroin and cocaine, with intent to supply.
- He was jailed for nine years after pleading guilty to conspiracy to supply class A drugs and possession of cocaine and cannabis.
- People taking class A drugs (cocaine and heroin) cost society millions of pounds a year.