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
Examples of heroin in a Sentence
Recent Examples on the Web
Other drugs in that class include heroin, marijuana and ecstasy.
—
Aria Bendix, NBC news, 29 July 2025
In 2015, a judge revoked Hall’s parole from a drug case after an Alameda County sheriff’s deputy pulled Hall over and, in the process, allegedly found him with heroin, according to court records.
—Jakob Rodgers, Mercury News, 20 July 2025
Cannabis is currently listed in Schedule I of the CSA, along with other substances like heroin, ecstasy, and LSD.
—Dario Sabaghi, Forbes.com, 17 July 2025
The list includes drugs such as heroin, cocaine and LSD.
—Bart Jansen, USA Today, 17 July 2025
See All Example Sentences for heroin
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Aria Bendix, NBC news, 29 July 2025
In 2015, a judge revoked Hall’s parole from a drug case after an Alameda County sheriff’s deputy pulled Hall over and, in the process, allegedly found him with heroin, according to court records.
—Jakob Rodgers, Mercury News, 20 July 2025
Cannabis is currently listed in Schedule I of the CSA, along with other substances like heroin, ecstasy, and LSD.
—Dario Sabaghi, Forbes.com, 17 July 2025
The list includes drugs such as heroin, cocaine and LSD.
—Bart Jansen, USA Today, 17 July 2025
See All Example Sentences for heroin
Cite this Entry
“Heroin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heroin. Accessed 7 Aug. 2025.
Copy CitationKids 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
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