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 episode on Massachusetts encompasses clambakes and heroin. —Yvonne Villarreal, Los Angeles Times, 6 Mar. 2026

In general, the data RADARS collected from people seeking treatment showed price, availability and purity matter most to those who use illicit drugs, which foreshadowed the shift from prescription opioids to heroin and fentanyl following a government crackdown on pill mills, Dart said. —Meg Wingerter, Denver Post, 5 Mar. 2026

Glenn Canyon Childers also denied charges of possessing Adderall, Xanax, methamphetamine, cocaine, heroin, psilocybin and ketamine. —City News Service, Oc Register, 5 Mar. 2026

In February 2024, he was also accused of trying to sell military-grade nuclear material, along with narcotics including heroin and methamphetamine, to buy weapons including surface-to-air missiles for armed groups in Myanmar. —CBS News, 4 Mar. 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