RhymeZone: amanitin definitions

Definitions of amanitin:

noun: (biochemistry) 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.

(Definitions from Wiktionary)