LSD
noun
: a semisynthetic illicit organic compound C20H25N3O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced
called also lysergic acid diethylamide
Examples of LSD in a Sentence
Recent Examples on the Web
Experts say the directive could expedite studies on how psychedelic and hallucinatory drugs such as MDMA, psilocybin, LSD and ibogaine may be useful in medicine.
—
Jackie Flynn Mogensen, Scientific American, 20 Apr. 2026
No psychedelic has been approved in the United States, but a number of them, including psilocybin, MDMA and LSD, are being studied in large trials for various mental health conditions.
—Matthew Perrone, Los Angeles Times, 19 Apr. 2026
No psychedelic has been approved in the United States, but a number of them are being studied in large trials for various mental health conditions, including psilocybin, MDMA and LSD.
—ABC News, 18 Apr. 2026
The Jefferson County Sheriff’s Office announced Thursday that the investigation started after an anonymous tip alleged that 25-year-old Hunter Covelli was selling large quantities of cocaine, MDMA, ketamine and LSD in Wheat Ridge.
—Jessica Alvarado Gamez, Denver Post, 17 Apr. 2026
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Jackie Flynn Mogensen, Scientific American, 20 Apr. 2026
No psychedelic has been approved in the United States, but a number of them, including psilocybin, MDMA and LSD, are being studied in large trials for various mental health conditions.
—Matthew Perrone, Los Angeles Times, 19 Apr. 2026
No psychedelic has been approved in the United States, but a number of them are being studied in large trials for various mental health conditions, including psilocybin, MDMA and LSD.
—ABC News, 18 Apr. 2026
The Jefferson County Sheriff’s Office announced Thursday that the investigation started after an anonymous tip alleged that 25-year-old Hunter Covelli was selling large quantities of cocaine, MDMA, ketamine and LSD in Wheat Ridge.
—Jessica Alvarado Gamez, Denver Post, 17 Apr. 2026
See All Example Sentences for LSD
Cite this Entry
“LSD.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/LSD. Accessed 22 Apr. 2026.
Copy CitationKids Definition
LSD
noun
: an illegal drug that causes abnormal sensations, extreme and changeable states of emotion, unnatural changes in the way time and space are experienced, and hallucinations and that may sometimes cause panic in response to the effects experienced
Medical Definition
LSD
noun
: a semisynthetic illicit organic compound C20H25N3O derived from ergot that induces extreme sensory distortions, altered perceptions of reality, and intense emotional states, that may also produce delusions or paranoia, and that may sometimes cause panic reactions in response to the effects experienced
called also acid, lysergic acid diethylamide, lysergide
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