/ Dictionary / Index P psilocin: Meaning and Definition of Find definitions for: psi•lo•cin Pronunciation: (sil'u-sin, sī'lu-), [key] — n. Biochem. a psilocybin metabolite with strong hallucinogenic potency, produced after ingestion of the mushroom Psilocybe mexicana. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: psilocin (Thesaurus) psilanthropism psilocybin Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language