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A highly toxic alkaloid, C9H20NO2, found in fly agaric and certain other mushrooms. When ingested, it binds to acetylcholine receptors and thus stimulates the parasympathetic nervous system.

[New Latin muscāria, specific epithet (from feminine of Latin muscārius, of flies, from musca, fly) + -ine.]

mus′ca·rin′ic (-rĭn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Physiology) of, relating to or resembling muscarine or its physiological action
2. (Physiology) (of a receptor) able to respond to muscarine
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Therefore, these results indicate that a possible alteration in muscarinic activity is caused by stevia EAF via [M.sub.3] receptors or its signaling pathway.
However, this beneficial effect of pyridostigmine at neuromuscular junctions is accompanied by unwanted muscarinic activity in other organs which can lead to serious side effects.
Estrogen has a significant action of increasing vagal and reducing sympathetic activity by enhancing the cholinergic muscarinic activity at both central and peripheral levels.