Source : Webster's Revised Unabridged Dictionary (1913)

Fly amanita \Fly amanita\, Fly fungus \Fly fungus\ . (Bot.)
   A poisonous mushroom ({Amanita muscaria}, syn. {Agaricus
   muscarius}), having usually a bright red or yellowish cap
   covered with irregular white spots. It has a distinct volva
   at the base, generally an upper ring on the stalk, and white
   spores. Called also {fly agaric}, {deadly amanita}.