Heroin (noun)

1. A highly addictive drug derived from morphine, used as a painkiller and often abused for its euphoric effects.
2. A white, crystalline powder that is derived from morphine and is a potent central nervous system depressant.
3. A powerful and highly addictive drug that is derived from opium and that is typically injected into a vein.
4. A drug that is derived from morphine and is used as a painkiller and often abused for its euphoric effects.

Origin:

German heroin, from french héroïne, from latin heroine, from greek hērōine.

Examples:

1. She became addicted to heroin.
2. The drug dealer sold heroin on the street.
3. The heroin was mixed with talcum powder.
4. The heroin was hidden in a bag.
5. The heroin was mixed with cocaine to make a speedball.