fly agaric
noun
- a medium to large poisonous amanita mushroom (Amanita muscaria) with a usually bright red cap
Wiktionary
noun
Etymology: The name is given because it was used as insecticide in England, similarly to many other European countries, compare e.g. Swedish flugsvamp and Russian мухомо́р (muxomór).
- A poisonous and hallucinogenic mushroom, Amanita muscaria, with a large crimson cap, fading to yellow, scattered with white flecks.