psilocybin
noun
psi·lo·cy·bin
ˌsī-lə-ˈsī-bən 
: a hallucinogenic indole C12H17N2O4P obtained from a fungus (such as Psilocybe mexicana or P. cubensis synonym Stropharia cubensis)
Examples of psilocybin in a Sentence
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People who use psilocybin recreationally may become confused and jump off a building, David Yaden, a researcher at the Center for Psychedelic and Consciousness Research at Johns Hopkins University, told me.
—
Ross Andersen, The Atlantic, 12 June 2026
As the patient may have experienced natural fluctuations in her medical condition, the study could not establish that psilocybin directly caused the woman’s improvements.
—Melissa Rudy, FOXNews.com, 9 June 2026
The analog girl in a digital world took the stage on Sunday evening to close out the festival wearing what looked like a mushroom cap on her head, accented by a frilly, droopy outfit that looked like it was designed by psilocybin.
—Steven J. Horowitz, Variety, 1 June 2026
While drugs like psilocybin and ibogaine — a psychoactive compound derived from a West African shrub that some advocates believe may help treat addiction and traumatic brain injuries — are considered classic psychedelics, MDMA is technically classified as an empathogen.
—Brandon Gomez, CNBC, 31 May 2026
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Ross Andersen, The Atlantic, 12 June 2026
As the patient may have experienced natural fluctuations in her medical condition, the study could not establish that psilocybin directly caused the woman’s improvements.
—Melissa Rudy, FOXNews.com, 9 June 2026
The analog girl in a digital world took the stage on Sunday evening to close out the festival wearing what looked like a mushroom cap on her head, accented by a frilly, droopy outfit that looked like it was designed by psilocybin.
—Steven J. Horowitz, Variety, 1 June 2026
While drugs like psilocybin and ibogaine — a psychoactive compound derived from a West African shrub that some advocates believe may help treat addiction and traumatic brain injuries — are considered classic psychedelics, MDMA is technically classified as an empathogen.
—Brandon Gomez, CNBC, 31 May 2026
See All Example Sentences for psilocybin
Cite this Entry
“Psilocybin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/psilocybin. Accessed 20 Jun. 2026.
Copy CitationKids Definition
psilocybin
noun
psi·lo·cy·bin
ˌsī-lə-ˈsī-bən
: a chemical that is obtained from a fungus and causes hallucinations
Medical Definition
psilocybin
noun
psi·lo·cy·bin
ˌsī-lə-ˈsī-bən
: a hallucinogenic indole C12H17N2O4P obtained from a basidiomycetous fungus (as Psilocybe mexicana or P. cubensis synonym Stropharia cubensis)
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