bufagin
noun
bu·fa·gin
| \ ˈbyü-fə-jən
\
\
Medical Definition of bufagin
: a toxic steroid C24H34O5 obtained from the poisonous secretion of a skin gland on the back of the neck of a large toad (Bufo marinus) that resembles digitalis in physiological activity
also
: any of several similar substances from secretions of other toads — compare bufotoxin