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
Recent Examples on the Web
In the pile, police also found a laundry bag containing six pounds of marijuana as well as $53,500 in cash and psilocybin mushrooms.
—
Frederick Sutton Sinclair, CBS News, 19 Feb. 2026
Its drug, called COMP360, could be the first psilocybin product on the market and the second psychedelic approved after Johnson & Johnson’s Spravato, a ketamine derivative.
—Elaine Chen, STAT, 17 Feb. 2026
Retired player Dan Carcillo, who has been open about his history of traumatic brain injuries and opened Experience Onward, a psilocybin treatment center in Oregon, got better only after saying the death of close friend and former hockey player Steve Montador saved his life.
—Stephen Whyno, Twin Cities, 10 Feb. 2026
By the time Colorado changed its laws, Liberato had become a regular user of LSD and psilocybin, and had begun teaching others how to use them for medicinal purposes at a healing center near Colorado Springs.
—Frederick Dreier, Outside, 22 Jan. 2026
See All Example Sentences for psilocybin
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Frederick Sutton Sinclair, CBS News, 19 Feb. 2026
Its drug, called COMP360, could be the first psilocybin product on the market and the second psychedelic approved after Johnson & Johnson’s Spravato, a ketamine derivative.
—Elaine Chen, STAT, 17 Feb. 2026
Retired player Dan Carcillo, who has been open about his history of traumatic brain injuries and opened Experience Onward, a psilocybin treatment center in Oregon, got better only after saying the death of close friend and former hockey player Steve Montador saved his life.
—Stephen Whyno, Twin Cities, 10 Feb. 2026
By the time Colorado changed its laws, Liberato had become a regular user of LSD and psilocybin, and had begun teaching others how to use them for medicinal purposes at a healing center near Colorado Springs.
—Frederick Dreier, Outside, 22 Jan. 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 23 Feb. 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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