• synonyms


[sil-uh-sahy-bin, sahy-luh-]
noun Pharmacology.
  1. a hallucinogenic crystalline solid, C12H17N2O4P, obtained from the mushroom Psilocybe mexicana.
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Origin of psilocybin

1955–60; < New Latin Psilocyb(e) genus of mushrooms (< Greek psīló(s) bare + kýbē head) + -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for psilocybin


  1. a crystalline phosphate ester that is the active principle of the hallucinogenic fungus Psilocybe mexicana. Formula: C 12 H 17 N 2 O 4 P
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Word Origin for psilocybin

C20: from New Latin Psilocybe (from Greek psilos bare + kubē head) + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for psilocybin


1958, from Modern Latin psilocybe, name of a Central American species of mushroom, from Greek psilos "bare" (see psilo-) + kybe "head."

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Online Etymology Dictionary, © 2010 Douglas Harper

psilocybin in Medicine


(sĭl′ə-sībĭn, sī′lə-)
  1. A hallucinogenic compound obtained from the mushroom Psilocybe mexicana.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

psilocybin in Science


[sĭl′ə-sībĭn, sī′lə-]
  1. A hallucinogenic compound obtained from certain mushrooms, especially of the genus Psilocybe. Chemical formula: C12H17N2O4P.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.