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Definition of Fly agaric
1. Noun. Poisonous (but rarely fatal) woodland fungus having a scarlet cap with white warts and white gills.
Medical Definition of Fly agaric
1. A toxic species of mushroom with yellow to red pileus and white gills; it contains muscarine, which produces psychosis-like states and other symptoms. Synonym: fly agaric. (05 Mar 2000)