Amanita

noun

1. Any of various mushrooms in the genus Amanita, many of which are extremely poisonous. Amanitas have white spores and usually a ring around the stalk and a rounded bulb at the base.
2. In mycology, a genus of fungi of the family Agaricaceæ, restricted by recent authors to white-spored species having the stem provided with both an annulus, or ring, and a volva. Over 50 species have been described, a number of which are common and widely distributed throughout temperate regions.
3. [lowercase] A plant of this genus.
4. 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 Agaricus phalloides is the death cup (or death cap).
5. Any of very many agaric mushrooms, of the genus Amanita, most of which are very poisonous