Dictionary.com
Thesaurus.com

sacred mushroom

British  

noun

  1. any of various hallucinogenic mushrooms, esp species of Psilocybe and Amanita, that have been eaten in rituals in various parts of the world

  2. a mescal button, used in a similar way

"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