Source : Webster's Revised Unabridged Dictionary (1913)

Amanita \Am`a*ni"ta\, n. [NL. See {Amanitine}.] (Bot.)
   A genus of poisonous fungi of the family {Agaricace[ae]},
   characterized by having a volva, an annulus, and white
   spores. The species resemble edible mushrooms, and are
   frequently mistaken for them. {Amanita muscaria}, syn.
   {Agaricus muscarius}, is the fly amanita, or fly agaric; and
   {A. phalloides} is the death cup.

Source : WordNet®

Amanita
     n : genus of widely distributed agarics that have white spores
         and are poisonous with few exceptions [syn: {genus
         Amanita}]