AMANITA
Amanita, genus Amanita
(noun) genus of widely distributed agarics that have white spores and are poisonous with few exceptions
Source: WordNet® 3.1
Etymology
Noun
amanita (plural amanitas)
Any of very many agaric mushrooms, of the genus Amanita, most of which are very poisonous
Source: Wiktionary
Am`a*ni"ta, n. [NL. See Amanitine.] (Bot.)
Definition: A genus of poisonous fungi of the family Agaricaceæ,
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 Unabridged Dictionary 1913 Edition