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
The synthetic opioid is 50 times stronger than heroin and 100 times stronger than morphine.
—
Brianne Tracy, PEOPLE, 19 Sep. 2025
Ian, an 28-year-old amateur mixed-martial-arts fighter who lives in the Pacific Northwest, had success using powdered kratom leaf to kick a heroin and Oxycodone addiction.
—Kansas City Star, 18 Sep. 2025
On her way home, Bendawald flagged her down in Eagle in his personal pickup truck and searched her car and found methamphetamine and heroin, according to her testimony and court records.
—Alex Brizee, Idaho Statesman, 17 Sep. 2025
Kennedy has spoken openly about his use of heroin, an opioid.
—Hollie Silverman, MSNBC Newsweek, 10 Sep. 2025
See All Example Sentences for heroin
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Brianne Tracy, PEOPLE, 19 Sep. 2025
Ian, an 28-year-old amateur mixed-martial-arts fighter who lives in the Pacific Northwest, had success using powdered kratom leaf to kick a heroin and Oxycodone addiction.
—Kansas City Star, 18 Sep. 2025
On her way home, Bendawald flagged her down in Eagle in his personal pickup truck and searched her car and found methamphetamine and heroin, according to her testimony and court records.
—Alex Brizee, Idaho Statesman, 17 Sep. 2025
Kennedy has spoken openly about his use of heroin, an opioid.
—Hollie Silverman, MSNBC Newsweek, 10 Sep. 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 22 Sep. 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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