amanitin /æməˈnaɪtɪn/ noun1 •A deadly amatoxin found in Amanita phalloides (the death cap), the four destroying angels (Amanita bisporigera, Amanita ocreata, Amanita verna, and Amanita virosa), and some other amanitas.Death caps contain a poison called amanitin which, according to the UK's Woodland Trust, is responsible for 90 per cent of all fatalities caused by ingesting fungus. — 2025 formsamanitins