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: Webster's Revised Unabridged Dictionary (1913)