heroin

noun

her·​o·​in ˈher-ə-wən 

ˈhe-rə-

: a strongly physiologically addictive narcotic C₂₁H₂₃NO₅ that is made by acetylation of but is more potent than morphine and that is prohibited for medical use in the U.S. but is used illicitly for its euphoric effects

heroinism

ˈher-ə-wə-ˌni-zəm 

ˈhe-rə-

noun

Examples of heroin in a Sentence

Recent Examples on the Web

The synthetic opioid is far more potent than heroin and has devastated communities across the country. —Greg Wehner, FOXNews.com, 6 Feb. 2026

Censori’s father, who had been convicted on heroin possession and firearm charges before Censori was born, owned a fleet of claw machines successful enough to send his middle-class children to private school. —Anna Peele, Vanity Fair, 6 Feb. 2026

Drug dealers mix fentanyl, because of its potency and low cost, with other drugs including heroin, methamphetamine and cocaine, which increases the likelihood of a fatal dose, according to the DEA. —Rosalio Ahumada, Sacbee.com, 4 Feb. 2026

Reeves plays Reef Hawk, a movie star who spends five years off the grid recovering from heroin addiction. —Matt Donnelly, Variety, 4 Feb. 2026

Word History

Etymology

from Heroin, a trademark

First Known Use

1898, in the meaning defined above

Rhymes for heroin

• heroine

Kids Definition

heroin

noun

her·​o·​in ˈher-ə-wən 

: a strongly addictive drug made from the opium poppy and stronger than morphine

Medical Definition

heroin

noun

her·​o·​in ˈher-ə-wən 

: a strongly physiologically addictive narcotic C₂₁H₂₃NO₅ that is made by acetylation of but is more potent than morphine and that is prohibited for medical use in the United States but is used illicitly for its euphoric effects

called also acetomorphine, diacetylmorphine, diamorphine