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
Tyson’s introduction to psilocybin proved life-altering.
—
Jerel Ezell, STAT, 1 May 2026
Drugs such as psilocybin and MDMA have demonstrated striking results in clinical trials to treat depression, post-traumatic stress disorder and other serious mental health conditions.
—Leana S. Wen, Washington Post, 28 Apr. 2026
The Natural Medicine Act, which decriminalized psilocybin and greenlit the state's development of a therapeutic pathway for mushrooms, also decriminalized ibogaine and other psychedelics.
—Olivia Young, CBS News, 24 Apr. 2026
Compass Pathways has been studying a proprietary formulation of synthetic psilocybin for treatment-resistant depression.
—Jacqueline Howard, CNN Money, 24 Apr. 2026
See All Example Sentences for psilocybin
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Jerel Ezell, STAT, 1 May 2026
Drugs such as psilocybin and MDMA have demonstrated striking results in clinical trials to treat depression, post-traumatic stress disorder and other serious mental health conditions.
—Leana S. Wen, Washington Post, 28 Apr. 2026
The Natural Medicine Act, which decriminalized psilocybin and greenlit the state's development of a therapeutic pathway for mushrooms, also decriminalized ibogaine and other psychedelics.
—Olivia Young, CBS News, 24 Apr. 2026
Compass Pathways has been studying a proprietary formulation of synthetic psilocybin for treatment-resistant depression.
—Jacqueline Howard, CNN Money, 24 Apr. 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 6 May. 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)
Love words? Need even more definitions?
Merriam-Webster unabridged
